Making homemade filling has been a breeze ever since I purchased my electric pressure cooker. I used to cook the beans and lotus seeds in my rice cooker and prepare sweet potatoes either by roasting or steaming. With those you need to frequently watch for the water level and make sure that there is no massive foam swells. Steaming sweet potatoes in the Instant Pot is pretty easy. All I do is to add a cup of tap water and lay the peeled sweet potatoes (no need to cube or slice them!) on the steaming trivet. After pressing a few buttons then my potatoes will all be soft and tender in a short period of time. Unlike red bean paste, lotus seed paste and chestnut paste, there is no need to reduce the liquid by cooking in a wok or skillet while preparing purple sweet potato paste. Just stir in the remaining ingredients and mash them while the sweet potatoes are still hot. For silky smooth texture you will need to pass the paste through a sieve. This extra step takes a bit of time and effort but it’s all worth it.
Below is the ingredients I use for my purple sweet potato paste in percentages. After weighing the cooked purple sweet potatoes, all other ingredients can be easily calculated.
Cooked purple sweet potato 已蒸熟紫薯 100%
Demerara sugar 原蔗糖 12 – 15%
Unsalted butter 無鹽牛油 10%
Maltose 麥芽糖 5%
Purple Sweet Potato Paste
Makes about 500 g
400 g purple sweet potato, peeled and cooked
48 to 60 g demerara sugar
40 g unsalted butter
20 g maltose
紫薯 (已去皮蒸熟) 400克
Wash and peel the purple sweet potatoes. Place 1 cup of water and the steaming trivet in the pressure cooker then lay the sweet potatoes on top (bigger ones may be cut in half). Close the lid and choose the steaming function and cook for 15 minutes. Remove the lid carefully after a 10 minutes of natural release. Cook by steaming: cut peeled purple sweet potatoes into cubes or slices and steam for 15 to 20 minutes until very soft.
Transfer sweet potatoes to a large mixing bowl and add in sugar. Mash with a spoon until sugar is dissolved, adding more of less sugar according to taste. Stir in butter and maltose until incorporated.
Pass mixture through a sieve for a smoother texture (it will be a great workout for your arms). Store purple sweet potato paste in an airtight container and press a piece of plastic wrap directly on top to prevent condensation. Cover and chill before use.
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