Lightly fry THE Bratwurst in some sunflower oil and keep warm. Peel the onions and cut into strips. Then fry in sunflower oil until slightly crusty. Deglaze with soy sauce.
Wash and peel the potatoes and cut into bits. Cook in salted water for about 20 minutes. In the meantime, wash the spring onions and cut off the root. Slice the green part of the onion into 2 cm long parts. Cut the white and light-green part into rolls.
Sort the rocket and cut off the stem. Wash and dry them. Cut off the cress.
Heat up the soya milk together with the olive oil, onion (only the green parts). Mash the potato. Shortly mix in the soya milk with a mixer and season with salt and pepper. Fold in the rocket, remaining onion and the cress.
Place some purée on a plate, garnish with the Bratwurst, parsley and rocket leaves. Pour some onion sauce over the dish. Serve straight away!