Purple sweet potato cake。紫薯千层糕，口感Q弹，清甜爽口，非常好吃！做法简单详细！

紫色食材：紫薯250克，清水600克，马蹄粉100克，白糖80克 白色食材：椰浆400克，纯牛奶200克，马蹄粉150克，白糖60克 Purple ingredients: 250 grams of purple potatoes, 600 grams of water, 100 grams of water chestnut powder, 80 grams of sugar White ingredients: coconut milk 400g, pure milk 200g, water chestnut powder 150g, sugar 60g