把材料备好，黄豆加水泡上 Prepare all the ingredients. Soak soybeans overnight in a bowl of water.

泡了一晚上的黄豆和去皮切块的紫薯（紫薯的大小无所谓） Remove the skin of purple sweet potato and cut into pieces. Also a bowl of pre-soaked beans.

把泡黄豆的水倒掉，加上十倍的水和切好的紫薯，全部放进高压锅 Drain beans and discard soak water. Add water (ratio of water to beans is 10:1), beans and purple sweet potato to pressure cooker.

高压锅压10分钟 Cook on high pressure for 10 minutes.

煮熟的黄豆、紫薯还有煮黄豆的水全部倒入榨汁机或者普通搅拌机打成汁就可以了，毕竟所有材料已经煮熟变软了 **用普通搅拌机或榨汁机开打前，建议先将其冷却约5分钟或者分几批小份量的打，不要装太满，因为热气在内部积聚会产生压力，盖子有可能会爆开。 Remove everything from pressure cooker and pour it into your blender jar and blend it until smooth. **Allow it to cook for about 5 minutes before blending as steam from hot liquids can build up inside the blender, potentially creating enough pressure to "blow" the lid off the top.

无需过滤渣渣，喝的时候再根据自己的口味加糖。 There is no need to strain this soymilk. Add sugar to taste before serving.