Direct answer: Smooth Chinese mung bean cakes are made by soaking peeled split mung beans, steaming them until completely tender, pressing or blending them while warm, then cooking the puree with sugar and a measured amount of fat until it forms a nonsticky dough. Cool slightly, portion and press firmly in a mooncake mold before chilling.
Key takeaways
- Use peeled split mung beans for a pale, fine cake.
- Steam rather than boil to avoid a watery puree.
- Cook the paste until it leaves the pan cleanly.
- Keep the fat moderate so molded patterns remain sharp.
- Chill covered cakes because they contain moist cooked beans.
What is lü dou gao?
Lü dou gao is a traditional Chinese pressed sweet made from mung beans, sugar and fat. It is especially associated with warm-weather tea snacks. The texture is dense, fine and melt-in-the-mouth rather than chewy or cake-like.
Traditional formulas vary by region. Some are plain and crumbly; others include sesame oil, butter or fillings. This beginner version uses peeled beans and neutral oil for a clean mung-bean flavor and clear molded details.
Ingredients for twelve small cakes
- 1 cup/200 g peeled split mung beans
- 1/3 cup/65 g granulated sugar
- 3 tablespoons/42 g unsalted butter or 45 ml neutral oil
- 1/4 teaspoon fine salt
- 1/2 teaspoon vanilla, optional
- 2 to 4 tablespoons/30 to 60 ml hot water only if needed for blending
Allow 8 hours soaking, 35 to 45 minutes steaming, 15 to 25 minutes cooking and 20 minutes molding. A fine sieve, food processor and 50-g mooncake press are helpful but not essential.
Choose the right beans
Buy yellow peeled split mung beans, sometimes labeled hulled mung dal. Whole green mung beans retain skins and create a darker, coarser cake. They are nutritious but need a different process and cannot simply be swapped by volume.
Check for stones or damaged beans. Rinse in several changes of cool water until the water is mostly clear.
Step 1: soak thoroughly
Cover beans with at least 3 inches/7.5 cm cold water and soak for 8 hours or overnight in the refrigerator. The beans should swell and break easily between two fingers.
In a cool kitchen, a 4-hour room-temperature soak may work, but refrigeration is safer for overnight soaking. Drain completely before steaming.
Step 2: steam until tender
Spread drained beans in a shallow heatproof dish. Steam over steadily boiling water for 35 to 45 minutes, stirring once halfway. Add boiling water to the steamer if needed.
The beans are ready when every piece crushes into a smooth paste with light pressure. Hard centers cannot be fixed during pan cooking and make the finished cake gritty.
Step 3: puree while warm
Transfer hot beans to a food processor with sugar and salt. Process until very smooth, scraping the bowl. Add hot water 1 tablespoon at a time only if the blades cannot move.
For the finest texture, push the puree through a fine sieve. Without a processor, mash thoroughly with a potato ricer, then sieve. Extra water makes the next stage longer.
Step 4: cook the paste
Put puree in a nonstick skillet over medium-low heat. Add butter or oil in three additions, stirring until each disappears before adding more. Cook and fold continuously for 15 to 25 minutes.
The paste is ready when it gathers into one smooth mass, leaves a clean trail on the pan and does not stick to a dry fingertip once slightly cooled. Stop before it becomes dry and cracked.
Step 5: cool safely
Spread paste on a clean plate in a 1-inch/2.5-cm layer and cover the surface. Cool for 15 to 20 minutes until comfortable to handle but still pliable.
Do not leave the moist bean paste at room temperature for hours. If interrupted, refrigerate it covered and bring it back toward room temperature before molding.
Step 6: portion and mold
Weigh twelve portions of about 35 to 38 g and roll each smoothly. Lightly brush a clean mooncake mold with neutral oil, shake out excess, insert one ball and press firmly onto parchment.
Hold pressure for 2 seconds, then release. Too much oil blurs the pattern. If the cake cracks, knead the portion with a few drops of water; if it sticks, cook the paste slightly longer.
Step 7: chill before serving
Arrange cakes in one layer in a covered container and refrigerate for at least 1 hour. Chilling firms the fat and makes the delicate cakes easier to lift.
Serve cool, not icy, with unsweetened tea. Let them stand 10 minutes after refrigeration for the best aroma and texture.
Texture control
The critical variable is water. Steamed beans require little extra liquid; boiled beans often hold too much. Add blending water reluctantly, then remove moisture over medium-low heat without scorching.
Butter creates a richer, firmer refrigerated cake. Neutral oil keeps the bean flavor clear and the texture softer. Coconut oil adds aroma and sets firmly when cold. Keep total fat near the stated amount so cakes do not feel greasy.
Substitutions and variations
Whole mung beans
Do not use them in this exact formula. Their skins require longer cooking and produce a rustic green-brown paste.
Lower sugar
Reduce sugar to 50 g. Going much lower makes the bean flavor more savory and can reduce the smooth impression.
Filled cakes
Wrap 25 g mung paste around 8 to 10 g red bean or black sesame paste, seal completely, then mold.
No mooncake mold
Press portions into a small silicone mold or shape compact rectangles by hand. The taste and texture remain the same.
Common mistakes
The cakes are gritty
The beans were under-soaked or under-steamed. Test several beans before pureeing and sieve the paste.
The mold will not release
The paste is too wet or the mold has excess fine detail. Cook longer and use only a film of oil.
The edges crack
The paste was overcooked or cooled uncovered. Knead in drops of warm water and keep unused portions covered.
The pattern disappears
The paste contains too much water or fat. Cook until it holds a clean ridge and chill after molding.
The cakes taste oily
Fat was added too quickly or the amount was excessive. Add it gradually and weigh the ingredients.
Food safety and storage
Soak overnight in the refrigerator, use clean equipment and keep the steamer at a steady boil. Cook beans until fully tender. Avoid tasting soaked raw beans or hot puree directly from the pan.
Refrigerate molded cakes at 40 F/4 C or below and eat within 3 to 4 days. Keep them covered so they do not dry out or absorb odors. Freeze in an airtight container for up to 1 month; thaw overnight in the refrigerator, although fine patterns may soften.
Related lessons
For another pressed festival sweet, study the dough and mold release in Cantonese mooncakes. Compare mung-bean texture with creamy red bean soup and smooth Chinese almond tofu.
Recipes4Less cooking courses demonstrate bean doneness, paste moisture and mold pressure so beginners can recognize the exact point where a loose puree becomes a clean, pressable dough.
FAQ
Are mung bean cakes baked?
No. The beans are fully steamed and the paste is cooked in a skillet before molding. The finished cakes are chilled, not baked.
Can I use canned mung beans?
No. They usually contain skins and too much liquid for this fine pressed style.
Why are peeled mung beans yellow?
The green color is mainly in the outer skin. The peeled interior is naturally pale yellow.
Can I make them vegan?
Yes. Use neutral oil or refined coconut oil instead of butter and verify any filling ingredients.
Can I ship homemade mung bean cakes?
They are moist and perishable, so ordinary unrefrigerated shipping is not recommended. Keep them cold and follow applicable local food rules.
Conclusion
Fine Chinese mung bean cakes require fully tender peeled beans, minimal blending water and patient pan cooking. Stop when the paste forms a smooth nonsticky mass, mold while pliable and chill promptly. With moisture controlled, lü dou gao releases cleanly with sharp patterns and a delicate crumbly texture that melts with tea.