Black Bean Jelly: A Silky, Savory Chinese Snack

Black bean jelly is a chilled Chinese-style savory jelly made by setting a seasoned black bean broth with starch, then slicing it to serve cold or gently warmed. This practical version uses fermented black beans for deep, salty flavor and cornstarch for an easy-to-find setting agent; the result is tender, smooth, and ready for a tangy soy-vinegar dressing.

Ingredients

2 cups (475 ml) water, divided
3 tablespoons (30 g) fermented black beans, rinsed and drained
2 tablespoons (30 ml) light soy sauce
1 tablespoon (15 ml) Chinese rice vinegar, plus more for serving
1 teaspoon (5 ml) toasted sesame oil
1 teaspoon (5 g) granulated sugar
½ teaspoon (1.5 g) finely grated fresh ginger
⅓ cup (40 g) cornstarch
2 tablespoons (30 ml) cold water, for the starch slurry
1 small cucumber, about 1 cup (120 g) thinly sliced or julienned
2 scallions, about 2 tablespoons (12 g) thinly sliced
1 teaspoon (3 g) toasted sesame seeds
Chili oil, to taste (optional)

Instructions

Prepare the pan. Lightly rinse a small loaf pan or square container, about 4 by 6 inches (10 by 15 cm), with cold water. Leave it damp; this helps the set jelly release later.
Make the seasoned broth. Put 1¾ cups (415 ml) water, fermented black beans, soy sauce, rice vinegar, sesame oil, sugar, and ginger in a small saucepan. Bring to a gentle simmer over medium heat, stirring to dissolve the sugar. Simmer for 5 minutes so the beans flavor the liquid, then remove from the heat.
Strain and measure. Strain the broth through a fine-mesh sieve into a heatproof measuring jug, pressing the beans lightly to extract their liquid. Discard or reserve the strained beans for another use. Add water as needed to bring the broth to exactly 2 cups (475 ml), then return it to the clean saucepan.
Mix the slurry. In a small bowl, whisk the cornstarch with 2 tablespoons (30 ml) cold water until completely smooth. Stir again just before using, because cornstarch settles quickly.
Thicken the broth. Bring the measured broth to a simmer over medium heat. While whisking continuously, pour in the slurry in a slow stream. Keep whisking for 2–3 minutes, scraping the corners and bottom of the pan, until the mixture turns glossy, thick, and opaque. It should bubble gently and fall from a spoon in a thick ribbon; do not stop whisking before it thickens, or the jelly may set unevenly.
Set the jelly. Immediately pour the hot mixture into the prepared pan and smooth the top. Let it cool at room temperature for about 30 minutes, then cover and refrigerate for at least 2 hours, until firm and thoroughly chilled. Keep the cooling time brief and refrigerate within 2 hours of cooking.
Unmold and serve. Loosen the edges with a thin spatula, turn the jelly onto a cutting board, and slice into strips or bite-size cubes. Arrange with cucumber and scallions. Finish with sesame seeds, a small splash of rice vinegar, and chili oil if desired.

Tips

Use fermented black beans, also called douchi, rather than black beans from a can. They are salty, fermented soybeans with a concentrated savory taste; rinse them to remove excess salt. If unavailable, use 1 tablespoon (15 ml) extra soy sauce and 1 teaspoon (5 ml) miso, though the flavor will be smoother and less distinctly fermented.
Measure the strained broth before adding the slurry. The cornstarch ratio depends on the final 2 cups (475 ml) of liquid; too much broth can leave the jelly soft, while too little can make it overly firm.
Whisk the slurry again immediately before pouring it in. If the pan is not bubbling or the mixture is not cooked until glossy, the starch may taste raw or fail to set properly.
For easier slicing, chill the jelly fully and use a sharp, lightly oiled knife. A little liquid may collect on the surface in the refrigerator; drain it gently before cutting.

Serving Suggestions

Serve the jelly cold as a small appetizer, side dish, or light snack, with plenty of cucumber for a fresh contrast. A dressing of rice vinegar, soy sauce, sesame oil, and chili oil suits its mellow bean flavor. Pair it with steamed rice, stir-fried vegetables, or noodles as part of a larger meal. For a more substantial plate, add blanched bean sprouts or thinly sliced scallions, keeping the toppings crisp and adding them just before serving.

Variations

For a clearer, milder jelly, omit the fermented beans and ginger and season the broth with soy sauce, a little vinegar, and sesame oil. To make a spicier version, stir chili oil into the broth before thickening, or serve it separately so each person can adjust the heat. You can also replace up to ½ cup (120 ml) of the water with unsalted mushroom broth for a rounder savory flavor; keep the total liquid at 2 cups (475 ml). For a chewier, more translucent texture, substitute ⅓ cup (40 g) mung bean starch for the cornstarch. Mung bean starch is common in some Chinese jelly preparations but may be sold in Asian grocery stores as green bean or mung bean starch; follow the package directions if its setting ratio differs.

Storage and Reheating

Cover and refrigerate the set jelly promptly, within 2 hours of cooking. It is best within 2 days and can be kept refrigerated for up to 3 days; the texture may gradually release water. Keep toppings and dressing separate until serving. Do not freeze it, because thawing makes starch jelly watery and grainy. This dish is usually served cold, so reheating is not necessary. If you prefer it warm, heat only the portion you plan to eat gently in a covered pan with a splash of water, and serve right away; it will soften and may lose its clean sliceable shape. Discard any portion left at room temperature for more than 2 hours.

Frequently Asked Questions

Is black bean jelly the same as sweet mung bean jelly?
Not necessarily. The name can refer to different regional or family preparations. This savory version uses fermented black beans and cornstarch, while some other Asian jellies use mung bean starch and may be served with different seasonings.

Can I use canned black beans?
Canned black beans are not a good substitute for fermented black beans in this recipe. They are soft, unfermented legumes with a much milder flavor and will not create the same seasoned broth. Use soy sauce and miso as described in the tips if fermented beans are unavailable.

Why did my jelly not set?
The most common causes are too much liquid, a slurry that was not stirred before adding, or a mixture that was removed from the heat before it became glossy and thick. Measure the strained broth carefully and simmer the starch mixture while whisking for the full 2–3 minutes.

Can I make it without cornstarch?
Yes. Mung bean starch is a suitable alternative and generally produces a firmer, more translucent, slightly chewier jelly. Use the same weight as a starting point, but check the package instructions because products can vary.

Can I make black bean jelly ahead?
Yes. Make it up to 2 days ahead, cover it, and keep it refrigerated. Slice it and add the cucumber, scallions, and dressing shortly before serving so the toppings stay fresh and the jelly does not sit in excess liquid.

Does the jelly need to be served cold?
No, but it is most stable and easiest to slice when cold. You can warm a serving gently, though the jelly will become softer and may no longer hold distinct slices.

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