Wash the plaice fillets, dab dry and cut into 2-3 cm wide strips. Wash lemon thoroughly and finely grate half of the peel. Squeeze the lemon. Sprinkle fish with approx. 3 tablespoons of lemon juice.
Season with salt and let it steep a little. Peas peel. Clean and wash the zucchini and cut them diagonally into thin slices. Peel and wash kohlrabi and carrots. Dice kohlrabi finely, cut carrots into thin slices.
Peel and finely chop the ginger. Mix ginger, soy sauce, remaining lemon juice and lemon peel. Heat some soy oil in a wok. Drain the fish slightly on kitchen paper and fry in portions in the hot oil.
Add vegetables and steam for about 5 minutes, turning carefully. Season to taste with the soy sauce mixture, cayenne pepper and possibly a little more salt. Serve with rice.