How to cook mung bean and aloe sweet soup: refreshing, with crisp aloe and no bitterness

A good mung bean and aloe sweet soup has beans that are cooked to a nutty softness but still hold their shape, a clean sweetness, and pieces of aloe that are translucent and crisp, with no slime or bitterness. This recipe for eight concentrates on peeling the green skin away completely, rinsing the sap out properly, and adding the aloe at the end so it does not go soft.

Quick facts

• Serves: 8 glasses.
• Preparation: 45 minutes.
• Soaking the beans: 2 hours.
• Cooking: 35-45 minutes.
• Served hot or cold.

Ingredients

• 300 g of split, hulled mung beans.
• 700 g of aloe flesh after peeling.
• 2.2 litres of water.
• 180-230 g of rock sugar.
• 4 pandan leaves.
• A pinch of salt.
• 200 ml of coconut milk, optional.
• Lime and clean ice.

Choosing and preparing the ingredients

The beans should be evenly yellow, with no weevils or mould. Aloe leaves should be thick, fresh green and unbruised, with clear gel and no brown areas. Only use a food-grade aloe from a source you trust; do not harvest an unidentified plant yourself.

Soak the beans for 2 hours, rinse them and drain. Peel away the green skin completely along with the yellow layer just beneath it, because this is what causes the bitterness and can upset the stomach. Cut the gel into cubes, rinse it several times in cool water, steep it briefly in salted lime water and rinse it thoroughly.

Step 1: blanch the aloe

Bring a separate pot of water to the boil, blanch the aloe for 30-45 seconds and transfer it straight into clean iced water. Drain it. Blanching it too long softens the gel; skipping it altogether can leave it slimy.

Step 2: cook the beans until nutty and soft

Put the beans and water in the pot, bring it to the boil, then lower the heat and skim. Cook until the beans are just soft but still holding their shape, stirring as little as possible. Top up with hot water if you need to.

Step 3: add the sugar at the right moment

Once the beans are soft, add the rock sugar and the pandan and stir gently until it dissolves. Sugar added too early makes the beans take longer to soften. Taste it once it has cooled a little and adjust a small amount at a time.

Step 4: add the aloe at the end

Drop the drained aloe into the pot, wait for it to come back to a gentle simmer for 1-2 minutes and turn off the heat. Do not cook it for long. Lift out the pandan so the aroma does not turn harsh.

Step 5: cool it and serve

Divide it into shallow containers to cool quickly and then keep it cold. Cook the coconut milk separately with a pinch of salt and spoon it over when serving; use clean ice and add it close to the time.

Ten small tips

1. Peel deeply enough to remove all the green.
2. Get rid of the yellow sap.
3. Rinse the gel several times.
4. Blanch it very briefly.
5. Chill the aloe straight away.
6. Soak the beans first.
7. Keep the pot at a gentle simmer.
8. Add the sugar after the beans have softened.
9. Add the aloe last.
10. Store the coconut milk separately.

Common mistakes and what to do

The aloe is bitter

Some green skin or yellow sap is still there. Do not try to mask it with sugar; discard the bitter part and prepare a fresh batch.

The aloe is slimy

It was not rinsed enough. Rinse it repeatedly, blanch it briefly and chill it in iced water; do not crush the gel.

The beans have collapsed

It boiled hard or was stirred too much. Lower the heat and stop stirring; serve the thicker version as a variation but check earlier next time.

The soup is too sweet

Add hot water and a pinch of salt, bring it back and taste; even if you are serving it with ice, do not over-sweeten it to compensate.

Scaling the recipe up or down

If you double it, use a wide pot and blanch the aloe in two batches. Start the sugar at 1.7 times and adjust once you know the final volume of liquid.

When you double the recipe, choose wider equipment rather than stacking the ingredients in layers. Start strong seasonings at about 1.7 times and taste again, because the surface area for evaporation does not scale linearly. When you halve the recipe, switch to a smaller pot or pan to keep the depth of liquid and the rate of heat transfer appropriate.

Organising the work so the dish is ready on time

Read the recipe through, weigh the ingredients and sort them into raw food, the parts to be cooked, vegetables that are eaten as they are, and the finishing touches. Have a separate clean tray for cooked food. A knife, board or pair of tongs that has touched raw food must be washed before it is used again. Do the steps that can be kept cold in advance, and leave the herbs, the frying or grilling and the assembly until close to the meal.

If you are cooking for a crowd, note down when each stage started and check the dish by temperature, tenderness and colour together, not by the clock alone. Taste a spoonful that has cooled for a few seconds, because food that is too hot makes salt and sweetness hard to judge accurately. Adjust the seasoning only in small amounts.

Serving and presentation

Serve it cold with clean ice, or warm; spoon the coconut milk on separately so each person can choose. Every glass needs both beans and aloe, and should not be stirred hard enough to break the beans.

Preparing ahead and storing

Chill it within 2 hours and use it within 3-4 days, though the aloe is at its best in the first two days. Keep the coconut milk separate. Do not let a portion with melted ice stand at room temperature and then put it back.

Cooked food should not be left at room temperature for more than 2 hours. Divide leftovers into shallow containers, chill them and use them within 3-4 days; when reheating, bring the whole portion to 74C. Only reheat what you are going to eat, and throw away anything with an odd smell, sliminess or other unusual sign rather than tasting it.

Allergy and safety notes

Coconut can cause a reaction in some people. The yellow sap of the aloe must be removed completely; anyone with an underlying condition or taking medication should be cautious about a large amount of aloe.

Pregnant women, young children, older people and anyone with a weakened immune system should eat food that is cooked right through and avoid cross-contamination. Read the label on packaged seasonings, as fish, shrimp, soy, wheat, egg, milk or peanut can appear in ready-made products.

Checking the finished dish

Before serving, check the safe temperature, the tenderness, the colour, the smell and the amount of liquid. Move the dish to clean bowls or plates and add the garnish close to serving time. If it has to wait, keep it hot properly but avoid carrying on with a strong heat, which dries the meat, softens the vegetables or thickens the liquid. Note down how much liquid and seasoning you actually used, so it is easier to repeat next time.

Controlling the heat and the equipment

The equipment should suit the quantity: too wide a pot boils the liquid away quickly, while too small a pot spreads the heat badly and leaves the food piled up. Heat it gradually and watch the size of the bubbles, the sound of the sizzle and the rate of evaporation, rather than just holding one setting on the dial. When you need to top up, use hot water so the cooking is not interrupted.

A food thermometer is a checking tool, not a substitute for looking at the texture. Measure at the thickest point, keeping away from bone and the bottom of the pot, and clean the probe before and after each use. With a dish of several components, check the largest piece or the part sitting in the cooler area of the pan.

A systematic way to taste and adjust

Before tasting, stir or ladle out a representative amount of the liquid and let it cool for a few seconds. Work out whether the dish is short on salt, sweetness, acidity, richness or aroma, and change only one element at a time. Strong seasonings such as fish sauce, shrimp paste, sugar or acid should go in a small spoonful at a time, and you should wait until they have dissolved completely before judging again.

If a dish is too salty, the thing that actually lowers the concentration is adding suitable unsalted ingredients or liquid, not adding sugar to mask it. If it is too sweet, increase the liquid and the salt a little before adding acidity. If the spices are harsh, take the bag or the solids out and let the dish rest; carrying on cooking usually makes the smell stronger.

A checklist before it goes to the table

• The raw ingredients have been cooked to a safe temperature.
• The vegetables eaten raw have been washed and drained.
• The serving utensils have not touched raw food.
• Hot dishes are hot enough and cold dishes are kept cold.
• The seasonings, dipping sauces and allergens have been clearly announced.
• The effect of the waiting time on crispness, chewiness or thickness has been allowed for.