Mince garlic, ginger, and shiitake mushrooms.
Cut medium-firm tofu into cubes.
Heat up sesame oil in a wok with garlic & ginger.
Cook lean ground beef (or pork/chicken/turkey) and shiitake.
Add chili bean paste, stock, black sesame seeds, soy sauce & sake.
Mix tapioca starch & water, add to wok. Gently stir & simmer.
Garnish with green onions.
Serve with black pepper & brown rice.