【ENG SUB】双色馒头的家常做法，松软香甜，一次成型，好看又好吃

所需食材：200g紫薯，50g牛奶，白醋：几滴，200g中筋面粉，3g酵母，300g中筋面粉，3g酵母，150g水
Ingredients:
200g purple sweet potato,50g milk,white vinegar: a few drops
200g all-purpose flour,3g yeast
300g all-purpose flour,3g yeast,150g water

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