Marinade for Ground Pork:
1 1/2 Tbsp tapioca starch (can substitute cornstarch)
2 tablespoons soy sauce
Other:
1/4 pound ground pork
1 pound regular tofu (medium firmness)
1 leek or 3 green onions
1/4 tsp salt
1 tsp Chinese salted black beans (fermented black beans, also called Chinese black beans), or to taste
1 Tbsp chili bean paste, or to taste
3 Tbsp stock (chicken broth)
1 Tbsp cornstarch
2 Tbsp water
2 Tbsp light soy sauce
Freshly ground Szechuan pepper
2 - 3 tablespoons oil for stir-frying, as needed