Blue Thai Curry with Butterfly Pea Flower and Tofu

Blue Thai curry is a Thai-inspired coconut curry tinted with butterfly pea flower tea, served here with tofu, vegetables, and jasmine rice. Butterfly pea flower gives the creamy sauce a blue-violet cast, while lemongrass, galangal, lime, and Thai basil bring aromatic curry flavors; this is a creative variation rather than a traditional named Thai curry, and the color naturally varies with the ingredients.

Ingredients

2 tablespoons (4 g) dried food-grade butterfly pea flowers
1 cup (240 ml) boiling water, for steeping the flowers
1½ cups (285 g) uncooked jasmine rice
1 tablespoon (15 ml) neutral oil, such as canola oil
⅓ cup (50 g) finely chopped shallot
2 tablespoons (12 g) thinly sliced lemongrass, tender inner part only
1 tablespoon (10 g) peeled, finely chopped galangal; substitute fresh ginger if needed
3 garlic cloves (9 g), peeled and chopped
1 teaspoon (2 g) coriander seeds
½ teaspoon (1 g) ground cumin
¼ teaspoon (0.5 g) ground white pepper
½ teaspoon (3 g) fine salt
1 can (13.5 ounces / 400 ml) unsweetened coconut milk, well shaken
½ cup (120 ml) low-sodium vegetable broth
2 cups (260 g) Thai eggplant or small globe eggplant, cut into bite-size pieces
1 cup (150 g) red bell pepper, sliced
1 cup (125 g) green beans, trimmed and cut into 2-inch (5 cm) lengths
1 cup (150 g) drained bamboo shoots, rinsed if salty
14 ounces (400 g) firm tofu, drained and cut into ¾-inch (2 cm) cubes
1 tablespoon (15 ml) vegetarian Thai seasoning sauce or light soy sauce
1 teaspoon (4 g) sugar
1 tablespoon (15 ml) fresh lime juice, plus lime wedges for serving
½ cup (10 g) loosely packed Thai basil leaves
1 small Thai green chile (about 5 g), thinly sliced, optional

Instructions

Steep the butterfly pea flowers. Put the dried flowers in a heatproof cup and pour over the boiling water. Steep for 10 minutes, then strain and reserve the blue infusion. Discard the flowers. This steeping time is included in the 35-minute prep estimate; use it to measure and cut the remaining ingredients.
Rinse and cook the rice. Rinse the jasmine rice in a sieve under cool water until the water runs mostly clear. Put it in a saucepan with 2 cups (475 ml) water. Bring to a boil, cover, reduce the heat to low, and cook for 15 minutes. Remove from the heat and leave covered for 5 minutes, then fluff with a fork. The covered rest happens while the curry finishes.
Make the aromatic paste. Grind the coriander seeds in a spice grinder or crush them with a mortar and pestle. Pound or finely process the shallot, lemongrass, galangal, garlic, coriander, cumin, white pepper, and salt into a coarse, damp paste. A few small pieces are fine, but mince the lemongrass especially finely so it is pleasant to eat. This homemade paste is deliberately mild and does not contain shrimp paste, which makes the curry suitable for vegetarians when the seasoning sauce is also vegetarian.
Fry the paste. Heat the oil in a medium, heavy saucepan or deep skillet over medium heat. Add the aromatic paste and cook for 3–4 minutes, stirring often, until fragrant and softened. Keep the heat moderate: browning the shallot or garlic too much can make the curry taste bitter and darken the blue color.
Build the blue coconut sauce. Pour in the coconut milk and the strained butterfly pea infusion. Stir well and bring the mixture to a gentle simmer, not a hard boil. Simmer for 3 minutes, stirring once or twice. The sauce should look blue-gray or blue-violet rather than brilliantly blue; coconut milk and spices soften the flower’s color, and the precise shade varies from batch to batch.
Simmer the vegetables. Add the vegetable broth, eggplant, bell pepper, green beans, and bamboo shoots. Bring back to a gentle simmer, cover partly, and cook for 8–10 minutes, stirring occasionally, until the eggplant is tender when pierced and the beans are cooked but still hold their shape. If the sauce gets thicker than you like, add a splash of water or broth.
Add tofu and season. Stir in the tofu, vegetarian seasoning sauce or soy sauce, and sugar. Simmer uncovered for 3–4 minutes so the tofu heats through and takes on some of the sauce. Taste carefully before adding more salt: seasoning sauces vary, and bamboo shoots can contribute saltiness.
Finish and serve. Turn off the heat and stir in the lime juice and Thai basil. Add the sliced chile if using. Lime can shift butterfly pea color toward purple, so add it gradually if you want to preserve a bluer appearance; serving lime wedges at the table lets everyone adjust the tang. Spoon the curry over jasmine rice and serve hot.

Tips

Start with food-grade flowers. Butterfly pea flowers are sometimes sold as tea or for crafts; use only food-grade dried flowers. A stronger infusion can deepen the color, but boiling the flowers for a long time is unnecessary and can add a grassy taste. Steep for the stated 10 minutes and strain well.
Know what changes the shade. Acid makes butterfly pea pigment shift from blue toward purple, and coconut milk dilutes its intensity. Add lime at the end and avoid adding extra acidic ingredients early. Do not expect a vivid, uniform blue: the curry will usually be a muted blue-violet, and that is normal.
Use the right substitutes. Galangal has a citrusy, pine-like aroma that ginger does not fully match; fresh ginger works in the same quantity but makes the curry warmer and less distinctly Thai in flavor. If Thai eggplant is unavailable, use small globe eggplant or zucchini. Zucchini cooks faster, so check it after about 5 minutes.
Keep the simmer gentle. A rolling boil can make coconut milk look grainy or separate, while a gentle simmer keeps the sauce smooth. Stir now and then, especially after adding the paste, and use a wide pan so the vegetables cook evenly without needing a long simmer.

Serving Suggestions

Serve the curry in shallow bowls with a generous scoop of jasmine rice, which soaks up the coconut sauce. Put extra lime wedges, Thai basil, and thinly sliced chile on the table so diners can tune the brightness and heat for themselves. A simple cucumber salad or lightly dressed shredded cabbage makes a crisp contrast to the soft eggplant and rich sauce. For a fuller spread, add steamed greens or a small plate of fresh herbs, but keep side dishes fairly simple so the aromatic curry remains the focus.

If the curry is being served family-style, keep the rice and curry in separate serving dishes rather than mixing them together. That helps the rice stay fluffy and makes it easy to adjust the amount of sauce in each bowl. The color is most noticeable in a pale bowl and before the lime is squeezed in; this is only a presentation detail, not a change in flavor or food safety.

Variations

Make it hotter: Add one or two sliced Thai green chiles to the paste, or serve them separately. Chiles can darken the sauce slightly, so keeping them as a topping preserves the clearest blue-violet look and lets each person choose the heat. For a milder bowl, omit the chile entirely; the curry’s flavor does not depend on it.

Change the vegetables: Swap in sliced mushrooms, carrots, snow peas, or cauliflower, keeping the total amount close to the listed vegetables. Add firm carrots with the eggplant so they have time to soften. Add delicate snow peas during the final 2–3 minutes to keep them bright and crisp. If using vegetables that release a lot of water, reduce the broth slightly or simmer uncovered briefly at the end.

Make it with chicken: Replace the tofu with 1 pound (450 g) boneless, skinless chicken breast or thighs cut into bite-size pieces. Add the chicken when the vegetables are nearly tender and simmer until the thickest pieces reach 165°F (74°C), checked with a food thermometer; this is the USDA FSIS safe minimum internal temperature for poultry. Use a clean thermometer and avoid relying on color alone. Chicken makes the curry nonvegetarian, and the cooking time may need a few extra minutes depending on piece size.

Make it vegan: The recipe is vegan if you choose a certified vegan seasoning sauce or soy sauce and check that the tofu and any packaged ingredients contain no animal-derived additives. Some Thai-style sauces contain fish or shrimp, so read the ingredient label rather than assuming every seasoning sauce is vegetarian.

Storage and Reheating

Cool leftovers promptly and refrigerate them within 2 hours of cooking, divided into shallow airtight containers so they chill efficiently. Store the curry and rice separately when possible. Both keep for 3–4 days in the refrigerator. The curry may become more purple after chilling or when reheated, particularly if lime juice has been mixed in; the color shift is a natural response to acidity and does not by itself mean the food has spoiled.

Reheat only the portion you plan to eat, on the stovetop over medium-low heat or in the microwave, stirring periodically. Add a tablespoon or two of water if the coconut sauce has thickened. Heat leftovers to 165°F (74°C), checked with a food thermometer, as recommended by USDA FSIS. Reheat rice until steaming hot throughout, and avoid repeatedly cooling and reheating the same container. For longer storage, freeze the curry in an airtight, freezer-safe container for up to 2 months for best quality; thaw it in the refrigerator and reheat as above. Coconut milk may look slightly separated after freezing, but stirring during reheating usually brings the sauce back together.

Frequently Asked Questions

Is blue Thai curry a traditional Thai dish?
This recipe is a Thai-inspired variation, not a standard traditional curry style with a single established recipe. Butterfly pea flower is used in Southeast Asian foods and drinks for its color, while the curry’s coconut milk, lemongrass, galangal, basil, and rice draw on familiar Thai flavor combinations. Regional and household curry recipes vary, so this version is best described by its ingredients rather than as the only authentic method.

Why did my blue curry turn purple?
Butterfly pea flower color responds to acidity. Lime juice, and other acidic ingredients, can shift the sauce toward purple; coconut milk and spices also make the color less vivid than the concentrated tea. Add lime at the end or serve it at the table if you want the sauce to stay bluer. A purple or muted blue result is expected and does not require a correction.

Can I use butterfly pea powder instead of dried flowers?
Yes, if it is food-grade butterfly pea powder. Start with about ½ teaspoon (1 g) whisked into the hot water, then add a little more only if needed; powders vary in strength and can leave a slightly earthy flavor. Strain the infusion if it has visible bits, and keep in mind that the finished curry will still be softened in color by the coconut milk.

Can I make the curry paste ahead?
You can prepare the aromatic paste up to 2 days ahead and keep it covered in the refrigerator. The butterfly pea infusion can also be made a day ahead and refrigerated separately. For the best color, stir the infusion before using it and add lime only when finishing the curry. Cooked curry and rice should be stored promptly in the refrigerator rather than left at room temperature for extended periods.

What if I cannot find Thai basil or galangal?
For basil, regular sweet basil is the easiest substitute; it tastes softer and sweeter, but still adds a fresh herbal finish. Fresh ginger can replace galangal in equal amounts, though it lacks galangal’s sharper citrus-pine aroma. Neither substitution prevents the curry from working, but the flavor will be less specifically Thai-inspired.

Can I make it without coconut milk?
Coconut milk is central to this curry’s creamy texture and mellow flavor, so a direct swap changes the result substantially. Unsweetened oat cream or cashew cream can make a creamy alternative, but each has a different flavor and may produce a different shade. Choose an unflavored product, add it gently, and adjust the broth gradually so the sauce does not become too thin.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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