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Ingredients:
Sweet potato     600g
Unsweetened soya bean milk  150ml

Steps:
1. Rinse sweet potato.  Steam for 20 minutes.
2. Peel and dice sweet potato.  Mash with a fork.
3. Add half of the soya bean milk and mix well.  Then add the remaining soya bean milk in several times and mix well.  No need to add all the soya bean milk, taste depends on personal preference.