Singaporean chili crab is a celebratory seafood dish of crab simmered in a tangy, savory tomato-chili sauce, often finished with beaten egg for a silky texture. The sauce is rich but bright, and it is traditionally served with soft mantou buns for dipping; recipes vary in their sweetness and heat, so this version lets you adjust both.
Ingredients
- 2½ lb (1.13 kg) raw crab, cleaned and cut into sections, with claws cracked; about 2 medium crabs
- 2 tbsp (30 ml) neutral oil, such as canola or peanut oil
- 2 medium shallots, peeled and finely chopped, about ⅓ cup (60 g)
- 5 garlic cloves, finely chopped, about 15 g
- 1 tbsp (15 g) finely grated fresh ginger
- 2 red fresh chilies, finely chopped, about 15 g; remove seeds for less heat
- 1 tsp (5 g) toasted belacan, also called fermented shrimp paste
- ⅓ cup (80 g) tomato ketchup
- ½ cup (120 g) finely chopped ripe tomato
- 2 tbsp (30 ml) sweet chili sauce
- 1 tbsp (15 ml) light soy sauce
- 2 tsp (8 g) granulated sugar
- ¾ cup (180 ml) water or unsalted seafood stock
- 1 tbsp (8 g) cornstarch mixed with 2 tbsp (30 ml) cold water
- 2 large eggs, lightly beaten
- 1 tbsp (15 ml) fresh lime juice, plus lime wedges for serving
- 2 scallions, thinly sliced, about 20 g
- Steamed mantou buns, for serving; allow 2–3 buns per person
Instructions
- Prepare the crab and aromatics. If the crab has not been cleaned, ask the fishmonger to clean and section it; this is safer and less messy than cutting through a hard shell at home. Keep the crab chilled while you chop the shallots, garlic, ginger, and chilies. Crack the large claws with the back of a sturdy knife or a crab cracker so the sauce can reach the meat, but leave the shell attached. Pat the pieces dry. If you are sensitive to chili, remove the seeds and membranes before chopping, and wash your hands well afterward.
- Build the sauce base. Heat the oil in a wide, deep skillet or wok over medium heat. Add the shallots and cook for about 2 minutes, stirring, until softened but not browned. Stir in the garlic, ginger, and chilies and cook for 30 seconds, just until fragrant. Add the belacan and mash it into the aromatics for another 30 seconds. Fermented shrimp paste smells strong while cooking, but it gives the finished sauce its rounded, savory depth.
- Simmer the sauce. Stir in the ketchup, chopped tomato, sweet chili sauce, soy sauce, sugar, and water or seafood stock. Bring the mixture to a gentle simmer and cook for 3 minutes, stirring so the tomato starts to soften and the sauce becomes cohesive. Taste a small spoonful. It should be sweet-sour and savory, with enough chili warmth to balance the crab; add a little more sugar or lime later if your tomatoes are especially tart.
- Cook the crab. Add the crab pieces and turn them in the sauce to coat. Cover the pan and simmer over medium-low heat for 8–12 minutes, turning the pieces once if they are not mostly submerged. The exact time depends on the crab’s size and whether the pieces are especially thick. Check the thickest portion of meat with a food thermometer, avoiding contact with the shell; USDA FSIS safe minimum guidance for seafood is 145°F (63°C). The meat should be opaque and firm, and the shell should be bright in color. Do not rely on shell color alone to judge doneness.
- Thicken and finish. Use tongs to transfer the cooked crab briefly to a warm platter, keeping the sauce in the pan. Stir the cornstarch slurry again, then add it gradually to the simmering sauce, stirring until glossy and lightly thickened, about 1 minute. Lower the heat. Slowly pour in the beaten eggs while stirring the sauce in a gentle circle; cook for 30–60 seconds, just until the egg forms fine ribbons and is set. Return the crab to the pan and turn it gently to coat. Stir in the lime juice and most of the scallions. Taste the sauce once more and adjust with a squeeze of lime or a pinch of sugar if needed.
- Serve while hot. Scatter the remaining scallions over the crab and bring the pan or a warm platter to the table. Set out napkins, seafood crackers, and small bowls for shells. Serve the mantou alongside so diners can scoop up the sauce as they eat.
Tips
- Ask for cleaned, sectioned crab. Fresh raw crab is ideal for this method, but preparation can be awkward without the right tools. A fishmonger can clean and cut it into manageable pieces. Keep it refrigerated until you are ready to cook, and do not leave raw seafood at room temperature while preparing the sauce.
- Belacan is potent, so measure carefully. Toasted belacan is a traditional fermented shrimp paste that adds a concentrated, savory note. If it is unavailable, use 1 teaspoon (5 ml) fish sauce instead. That substitute tastes cleaner and less fermented, so the sauce will be a little less deep; avoid adding both unless you want a saltier result.
- Control the heat in layers. Fresh red chilies vary considerably in strength. Begin with one chili if you prefer mild food, then add chili flakes or a little extra chopped chili near the end if you want more heat. Sweet chili sauce also contributes sweetness, so taste before increasing the sugar.
- Keep the sauce loose enough to dip. The cornstarch slurry should give the sauce a light gloss, not turn it into a thick paste. Add it in stages and stop when the sauce clings to the crab. If it thickens too much, stir in warm water or stock one tablespoon (15 ml) at a time.
Serving Suggestions
Serve chili crab as the centerpiece of a shared meal, with the crab arranged in its sauce and a generous supply of warm mantou. Steamed buns are especially useful for collecting the sweet, tangy gravy. If you cannot find mantou, plain soft dinner rolls or slices of lightly toasted white bread are practical alternatives, though they do not have the same tender, slightly chewy texture. A bowl of steamed jasmine rice is another good option and makes the meal more substantial.
Because eating shell-on crab is hands-on, keep the rest of the meal simple. Offer lime wedges, plenty of napkins, a bowl for discarded shells, and seafood crackers or kitchen shears for the claws. A crisp cucumber salad or lightly dressed greens can provide a fresh contrast without competing with the sauce. For a shared spread, add a plain vegetable side such as steamed greens; avoid heavily seasoned sides that would overwhelm the crab’s sweet-sour balance.
Variations
Adjust the flavor profile: For a brighter, less sweet sauce, reduce the sugar to 1 teaspoon (4 g) and add another teaspoon of lime juice at the end. For a milder family-style version, use one seeded chili and keep the sweet chili sauce as written. If you enjoy more heat, add a teaspoon of sambal oelek or chili paste with the ketchup. Sambal varies by brand and can be salty, so add it gradually and taste before adding extra soy sauce.
Use cooked crab: If you have cooked crab legs or picked cooked crab meat, do not simmer them for the full raw-crab cooking time. Make the sauce, thicken it, and finish the egg first; then fold in the cooked crab just long enough to heat it through, usually 2–3 minutes. The sauce will be less infused with crab juices, but this is a convenient way to use leftovers or precooked seafood. Check that the crab is hot throughout, and take care not to break the meat into tiny pieces.
Choose another shellfish: Large prawns can be cooked in the same sauce, but they need less time. Add peeled, deveined prawns and simmer just until opaque and firm, checking the thickest one with a thermometer for the seafood safe minimum of 145°F (63°C). Mussels or clams can also work, but they release liquid and may need a little less added stock. Discard any that do not open during cooking. These changes make a different dish rather than a strict version of Singaporean crab, but the sauce remains a useful match.
Storage and Reheating
For best texture, serve the crab as soon as it is cooked. Refrigerate leftovers within 2 hours, transferring them to a shallow, covered container so they cool promptly. Keep cooked crab and sauce refrigerated at 40°F (4°C) or colder and use within 3–4 days. If the crab was already cooked before it went into the sauce, follow the same storage limit and avoid repeatedly warming and cooling it.
To reheat, place the crab and sauce in a covered skillet over low heat with a splash of water. Turn the pieces gently and heat until the center of the crab meat reaches 165°F (74°C), the USDA FSIS temperature for reheated leftovers. Check with a food thermometer, especially for large claw sections. Reheating slowly helps prevent the sauce from catching and the crab from drying out; avoid a hard boil. A microwave can work for a small portion, but use a covered microwave-safe dish, pause to turn the pieces, and verify the temperature in the thickest meat. Freeze leftovers only if necessary: the sauce may separate and the crab texture can become softer after thawing.
Frequently Asked Questions
Is Singaporean chili crab always very spicy?
No. The heat depends on the type and quantity of fresh chili, and home recipes range from gently warm to quite fiery. Start with one seeded chili if you are unsure, then increase the heat at the table with chili paste. Ketchup, tomato, and sweet chili sauce make the gravy rounded and tangy rather than simply hot.
Can I make the sauce ahead?
Yes. You can cook the sauce base through the simmering step, cool it promptly, and refrigerate it in a covered container for up to 2 days. Reheat it to a simmer before adding raw crab, then continue with the crab-cooking step and finish with the slurry and egg. Do not add the egg ahead; it is best cooked just before serving.
What kind of crab should I buy?
Use fresh raw crab that your seafood counter can clean and section. Mud crab is often associated with Singapore-style preparations, but availability varies; blue crab or another substantial local crab can work. Choose pieces with intact shells and a fresh, mild sea smell. If buying frozen crab, thaw it safely in the refrigerator and drain it well before cooking.
Can I use frozen crab?
Yes, provided it is raw crab and has been thawed in the refrigerator rather than on the counter. Pat it dry so excess thawing liquid does not dilute the sauce. Frozen crab pieces may be smaller or already cut, so begin checking for doneness at the early end of the cooking range and use a thermometer rather than relying only on the clock.
Why did my sauce turn watery?
Crab can release liquid as it cooks, and tomatoes also vary in moisture. Simmer the sauce uncovered for a minute or two after removing the crab, then add the cornstarch slurry gradually. If it is still thin, mix another teaspoon (3 g) of cornstarch with a tablespoon (15 ml) of cold water and stir it in; never add dry cornstarch directly, because it can clump.