Pata Tim with Cuapao

1 onion, sliced
2 tablespoons minced garlic
2 tablespoons sliced ginger
¼ cup soy sauce
¼ cup oyster sauce
1-2 tablespoons rice wine
8 pieces star anise
1 teaspoon peppercorn
1-2 tablespoons fish sauce
2-3 tablespoons brown sugar
Sesame oil
2-3 kg Pata (or mix of Pata, and pork belly or shoulder)
3-4 cups water
1 cup shitake mushrooms, dried

Cuapao:
4 cups all-purpose flour (or bread flour)
1 ¾ cup water
¼ cup cooking oil
1 tablespoon yeast
¼ cup sugar
1 teaspoon salt

Cilantro topping:
1 cup toasted peanuts
Sprig of cilantro
Sugar