Peel and finely chop the onion. Peel garlic and chop finely. Cut Tempeh into approx. 0.5 cm thin slices and halve if necessary. Heat 5 tablespoons of oil in a large frying pan. Fry the tempeh for 4-5 minutes while turning it over until golden brown.
Take it out. Put 2 tablespoons of oil into the pan and fry the onion and garlic until transparent, turning them over. Mix starch with stock until smooth. Deglaze onion mixture with sake, add stock, bring to the boil, add Tempeh and simmer covered for about 10 minutes, stirring occasionally.
Add capers after about 5 minutes.
In the meantime, prepare rice in boiling salted water according to the instructions on the packet. Wash parsley, shake dry, pluck off leaves and chop coarsely except for a little to garnish. Drain the rice, mix 3/4 of the chopped parsley into the rice.
Season tempeh with salt and pepper and arrange on plates. Garnish with remaining parsley. Serve with rice.