Baked Vegetable Manapua

All you need is:

1 package dried yeast

1 cup warm water (105 degrees F)

1 tbsp turbinado sugar

2 tbsp oil

1 tsp salt and papper

3 cups flour 

3 tbsp butter

for the Filling:

2 cups finely chopped broccoli

2 cups chopped Chinese cabbage

1 tsp minced fresh ginger

1/2 cup sliced water chestnuts

1 cup chopped cashews

3 tbsp shoyu (soy sauce)

1 tsp turbinado sugar

1/4 cup water

1 tbsp cornstarch

1/4 tsp lemon juice

1 tbsp sesame oil