Steam tempeh 2-3 minutes. Cut into 1/2 inch cubes, then add to a bowl with the marinade and stir to coat. Set aside for 15 min.
Prepare the stir-fry sauce in a small bowl.
Heat oil over medium heat. Add 1 tsp red chili flakes and the schezuapn peppercorns. Fry until blackened, then discard spices but keep the oil in the pan.
Add minced ginger and scallions (white parts only).
Add tempeh and 1 tsp red chili flakes.
Once tempeh is well heated, add mushrooms. When mushrooms appear cooked, add sauce, take the pot off of heat, stir in peanuts, and garnish with green onions.