Soften the sweet potato by boiling or microwaving, then mash. Heat the okara in the microwave at 500-600 W for 2 minutes and set aside.
Add all the ingredients to a bowl and knead together, washing your hands well beforehand.
Roll into whatever sized balls you like, and they're done. Enjoy with a drink.
I rolled it into small balls (5 g) and put them in a bowl of plain yogurt, and it was really delicious.
You can also sprinkle with some cinnamon.
When making with skim milk, replace the condensed milk for 3 tablespoons skim milk and 1.5 tablespoons of sugar.
Addendum: Store in the refrigerator. As they include okara, eat them up as soon as possible.
Story Behind this Recipe
I was going to bake cookies using sweet potatoes and okara, but the dough tasted so good that I just turned that into a recipe.
The moisture content of sweet potatoes and okara tends to vary, so if your mixture is a little dry add a drop of milk – enough to make the dough soft enough to roll into balls with your hands. I used 0.5 tablespoons of milk. You can achieve a similar taste using skim milk (see Step 6). For Step 5, sprinkle on whatever takes your fancy.