Chinese Yam and Lean Pork Soup (Pureed) | IDDSI Level 4 Recipe

IDDSI Level 4 (Pureed) | 75 minutes | Easy

Chinese yam and lean pork soup (淮山瘦肉湯, waai saan sau yuk tong) is a gentle, milky-white Cantonese 老火湯 that has been prescribed in Hong Kong households as a digestive tonic for generations. Chinese yam (淮山, Dioscorea opposita or D. polystachya) is classified in traditional Chinese medicine as neutral in nature and sweet in flavour, attributed with the ability to strengthen the spleen and stomach, improve digestion, and nourish the lungs and kidneys. It is particularly recommended for the elderly, for those recovering from illness, and for individuals with poor appetite or sensitive digestion. The naturally high starch content of Chinese yam means that when blended with the soup broth and cooked pork, it thickens the liquid into a smooth, velvety texture without the need for added thickeners. This property makes it uniquely well-suited to IDDSI Level 4 Pureed adaptation. The cooked yam pureed into the broth produces a cohesive, smooth pudding-like consistency that is stable on a spoon, does not flow at room temperature, and passes the IDDSI Level 4 fork-drip test criteria with the yam starch providing natural body.

Ingredients (2–3 servings)

• 250g fresh Chinese yam / waai saan (淮山; available at wet markets peeled or in 30cm segments; or 30g dried Chinese yam slices — soak 30 min before use)
• 200g lean pork shoulder or lean pork loin (cut into 3–4cm chunks)
• 800ml water
• 3 slices fresh ginger
• 4 dried red dates (stoned; optional — adds mild sweetness and colour)
• 1/2 tsp fine sea salt
• White pepper to taste

Method

1. If using fresh Chinese yam, peel carefully under running water (wear gloves — the surface mucilage can cause skin irritation) and cut into 4cm chunks. If using dried slices, soak in water for 30 minutes, drain.
2. Blanch pork in boiling water for 3 minutes. Drain and rinse.
3. Combine pork, Chinese yam, ginger, dates (if using), and 800ml water in a saucepan. Bring to the boil, skim any foam.
4. Reduce to low heat. Cover and simmer for 60 minutes until pork is very tender and yam is completely soft — a chopstick should pierce through yam with zero resistance.
5. Remove ginger slices and date skins. Add salt and white pepper.
6. Transfer all contents (pork chunks and yam together with the broth) into a blender. Blend on high for 60–90 seconds until completely smooth.
7. Pass through a medium-mesh sieve to remove any remaining fibrous strand. Return to saucepan and warm gently over low heat.
8. Adjust consistency: if too thick, add a small amount of warm water and blend briefly. If too thin (flows freely), simmer uncovered for 5 minutes to reduce. Target texture: holds its shape on a spoon for a few seconds before slowly slumping, does not flow freely.
9. Taste and adjust salt. Serve at 50–60°C.

Texture Test

IDDSI Level 4 (Pureed) confirmation: Place a teaspoon of the pureed soup onto a flat plate and tilt to 45 degrees — the puree should hold its shape and not flow freely. It should not pour like a liquid. A fork pressed into the surface should leave tine marks without the mixture flowing back in immediately. The texture should be smooth, cohesive, and lump-free.

Spoon tilt test: The puree should remain on a loaded spoon at 45 degrees without dripping freely for at least 3–5 seconds, then slowly slump — not run — off the spoon.

Safety Notes

⚠️ Blend completely smooth — cooked pork must be blended to a completely lump-free smooth paste. Even small fibrous fragments of pork or yam present aspiration and choking risks for Level 4 Pureed diets. If a high-speed blender is not available, pass through a fine sieve after blending.

⚠️ Chinese yam mucilage precaution — raw Chinese yam releases a slippery mucilage (oxalate compounds) that can cause skin itching during preparation; wear gloves when peeling. This compound is fully neutralised by cooking and is safe to consume once cooked.

⚠️ Date stone confirmation — inspect stoned dates before use and confirm no stone fragments remain.

⚠️ Consistency check before each serving — pureed soups can separate on standing. Stir well and recheck texture each time before serving.

Sourcing in Hong Kong

• Fresh Chinese yam (淮山): Wet markets (fresh vegetable stalls); sold in 30cm white cylindrical segments, sometimes pre-peeled; choose firm pieces with no soft spots or surface mould
• Dried Chinese yam slices: Chinese herbalists and supermarket dried goods aisle; pale, cream-coloured slices are preferred; discard any discoloured or musty-smelling pieces
• Lean pork shoulder: Wet market pork stalls; ask the vendor to trim visible fat; or use supermarket lean pork loin

Nutrition

Approximately 120–150 kcal per serving (200ml pureed). Chinese yam is a meaningful source of dietary starch, potassium, B vitamins, and allantoin. The pureed pork contributes 8–12g protein per serving — significantly more than a strained broth — making this Level 4 format an effective vehicle for protein delivery in elderly individuals with chewing difficulties. The natural thickening from Chinese yam starch eliminates the need for commercial thickeners, making this a clean-label, culturally resonant texture-modified option.

Cultural Note

淮山瘦肉湯 holds a special place in Cantonese wellness culture as a gentle, restorative soup appropriate for all ages but particularly recommended for the elderly, the unwell, and those with weak digestion. The milky white colour and subtle, mildly earthy sweetness of the soup are instantly recognisable to older Hong Kong residents. Serving this as a smooth Level 4 puree rather than straining it to a clear broth preserves both the visual identity and the nutritional density of the original — a meaningful distinction that signals care and effort rather than compromise.