Tong Sui, literally “sugar water”, refers to the sweet and soup like dessert served at the end of a meal in the Chinese culture. Dessert soup made with sweet potatoes is one of the easiest ones to make. All you need is to dump the cubed sweet potatoes and ginger slices into water, boil until they are tender and then season with sugar. My mom used to make it over the stove but I’m now making it with my Instant Pot (an electric pressure cooker).
糖水是中菜裡常見的飯後甜品，而番薯糖水則是較易做的種類。只需把番薯塊和薑片加水煮至番薯軟化，再加糖調味便行。EC媽媽一般用爐火煮糖水，自從購買了電子壓力鍋Instant Pot之後，它便成為EC煮糖水的小幫手。
If you have ever made dessert soup that is very cloudy with mushy sweet potatoes, there is one tip I’d like to share with you. The trick is to soak the sweet potatoes in water before cooking. Soaking removes some amylose (a kind of starch molecule) in the sweet potatoes. When you look into the bowl of water you will notice cloudiness and starch sediment on the bottom. With less starches the color of your dessert soup will be much clearer and the sweet potatoes will be tender yet firm in texture. It is also a great news for ladies who are concerned about carbohydrate intake.
煮糖水時試過糖水顏色很混濁和番薯過於軟爛嗎？EC今天分享小方法改善糖水外貌。秘訣就是番薯要事先以清水浸泡。泡水可把番薯表面的直鏈澱粉(澱粉質的一種)洗走，浸泡時可看見澱粉質沉澱到水的底部。少了澱粉質，糖水便變得很清澈，而番薯煮腍後也不會爛開。身體不用吸收太多澱粉質，應該是女仕們的福音吧！
Chinese Sweet Potato Dessert Soup
番薯糖水
Serves 6
六人份量
ingredients
500 g sweet potatoes, peeled and cubed (from about 3 medium sweet potatoes, I used 1 sweet potato and 2 Okinawan sweet potatoes)
3 slices of ginger
1 L water
1 piece slab sugar (or to taste)
材料
番薯(去皮切塊) 500克 (約3個中型番薯，EC用了1個橙肉番薯和2個夏威夷紫薯)
薑 3片
片糖 1塊(可按喜好增減)
水 1公升
Directions 做法
Wash, peel and cut the sweet potatoes into cubes. Place them in a large bowl and soak in water for 30 to 60 minutes. Change the water once or twice with rinsing in between to remove any starch sediment. Drain and set aside.
番薯洗淨後去皮切塊，放大碗中加入清水(份量以外)浸泡30至60分鐘，期間換水一至兩次沖洗沉在底部的澱粉質，瀝乾備用。
Place sweet potato cubes, ginger slices and the slab sugar into the Instant Pot. Add water to cover the ingredients (I add hot water to speed up the heating process). Cover the pot, turn venting knob to sealing position and select “manual” function. Set to low pressure and pressure cook for 5 minutes. When timer beeps, wait 10 minutes before releasing pressure. Carefully remove the lid and serve. The soup dessert can be served hot or chilled.
把番薯塊，薑片和片糖放入Instant Pot內鍋後加水(水量須蓋過所有材料，想快一點可用熱水)，關上鍋蓋把排氣閥調整到密封“sealing”位置，按“manual” 鍵選擇低壓煮5分鐘，煮好後待10分鐘才放壓排氣，小心打開蓋子後可取出享用，熱或冷吃皆可。
Stovetop method: Place 1.5 L of water into a pot and bring to a boil. Add sweet potato cubes and ginger slices. When it comes to a boil again, cover and reduce to low heat and simmer for 15 to 20 minutes until the sweet potatoes are tender. Add slab sugar and boil until sugar dissolves. Remove from heat.
爐火做法：將1.5公升水放入鍋中，煲滾後加入番薯塊和薑片，再次滾起後加蓋小火煮15至20分鐘至番薯變腍便可加入片糖調味，煮至片糖溶解後即可離火。
This one was made with Korean sweet potato and Okinawan sweet potato. I added tang yuan (glutinous rice balls) after making the soup with Instant Pot.
這個用了韓國番薯和夏威夷紫薯，煮好後另外加了湯圓。
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