1. Put the flour, yeast, water, condensed milk and sugar into the toaster and mix well.
2. Knead into dough and let stand for half an hour.
3. Mix golden sand dumpling with lard and water to make stuffing. This is the quicksand filling in the quicksand bag.
4. Divide the dough into small portions. Roll the dough into a round piece. Fill in the filling.
5. Wrap it and pinch it tightly. Close the mouth downward, cover with plastic wrap, and ferment again.
6. Put the steamed buns into the steamer and steam them. Remove, complete. The delicious quicksand bag is ready.