Rice Milk Sweet Potato Congee | IDDSI Level 3 Dairy-Free Staple Recipe

IDDSI Level 3 (Liquidised) | 25 minutes | Easy

Rice milk sweet potato congee is a traditional Hong Kong and Cantonese staple — white rice soaked and ground into a smooth rice milk, then cooked together with sweet potato to produce a silky, naturally sweet, warming liquidised dish. The natural starch in rice milk provides body and flow consistency without the need for additional thickeners, while sweet potato contributes natural sweetness and a soft, blendable texture. After thorough blending and straining, the finished congee meets IDDSI Level 3 (Liquidised) standards. This recipe is entirely dairy-free and naturally gluten-free, making it one of the simplest and most accessible allergy-friendly dysphagia meal options.

Ingredients (serves 2)

• White rice 50g (rinsed, soaked for 30 minutes)
• Yellow sweet potato 200g (peeled, cut into small pieces)
• Water 500ml (split: 200ml for rice milk, 300ml for cooking sweet potato)
• Slab sugar or rock sugar 30g (to taste — can reduce or omit)
• Salt 1 pinch (optional, to season)

Method

1. Drain the soaked rice and place in a blender with 200ml water. Blend on high speed until completely smooth to make rice milk. Strain through a fine sieve if needed. Set aside
2. Place sweet potato pieces in a pot with the remaining 300ml water and the sugar (and salt if using). Bring to a boil over medium heat, then reduce to a simmer, cover, and cook for about 15 minutes until the sweet potato is completely tender
3. Transfer the cooked sweet potato with its cooking liquid to a blender and blend on high speed until completely smooth (30–60 seconds)
4. Pour the sweet potato puree back into the pot and add the rice milk. Heat over medium-low heat, stirring constantly, for 5–8 minutes until the mixture thickens to a uniform, cohesive congee
5. Pass through a fine-mesh sieve to remove any remaining particles or sweet potato fibres — the finished congee must be completely smooth
6. Using a syringe test, confirm texture: 10ml should yield less than 1ml outflow in 10 seconds, confirming IDDSI Level 3
7. If too thin, continue heating and stirring until thickened; if too thick, add a small amount of hot water and stir to adjust

Texture Test

IDDSI Level 3 (Liquidised) confirmation: The strained congee should flow slowly and continuously — poured from a spoon it should form a steady stream, not splash or flow rapidly like water. A syringe test should yield less than 1ml outflow in 10 seconds. There must be no solid sweet potato or rice particles in the finished product.

Safety Notes

⚠️ Strain thoroughly — Sweet potato contains more fibre than most root vegetables. Even after thorough blending, fine fibres may remain. Always pass through a fine-mesh sieve to ensure the congee is completely particle-free.

⚠️ Rice milk cooks quickly — When raw rice milk is added to heat, it thickens rapidly. Stir constantly to prevent it from sticking or forming clumps. If lumps form, re-strain or remake.

⚠️ Sweet potato variety — Yellow-flesh sweet potato (including Japanese kuri sweet potato or local yellow varieties) blends smoother and is naturally sweeter than purple-flesh varieties. Avoid particularly fibrous varieties.

Sourcing in Hong Kong

• Yellow sweet potato: Available at wet markets and supermarkets — choose riper ones that yield slightly to gentle pressure, as they break down more easily
• White rice: Jasmine or Thai fragrant rice blends into a smoother rice milk than short-grain varieties

Nutrition Notes

Per serving (approx. 300ml): approximately 160 kcal, 35g carbohydrate, 3g protein, 0.5g fat. Sweet potato is rich in beta-carotene (pro-vitamin A), vitamin C, and dietary fibre — supporting gut health and immune function. This recipe is naturally free from dairy and gluten. Rice milk provides easily digestible starch energy, making it gentle on the digestive system for elderly individuals with weaker gut function.

Cultural Context

Rice milk sweet potato congee is a humble staple of Hong Kong’s Cantonese culinary heritage — in earlier decades when resources were scarce, this simple combination of rice and sweet potato fed families across the territory. It requires no dairy, no artificial thickeners, and no expensive ingredients, relying purely on the natural properties of grain and root vegetable. For elderly individuals with dysphagia, adapting this dish to IDDSI Level 3 liquidised standards is a way of making everyday food safe — while preserving the warmth and familiarity of a dish that has been on Hong Kong tables for generations.