Wash the cabbage leaves and cut the middle panicle flat. Blanch the leaves for about 3 minutes in boiling salted water. Remove and rinse under cold water. Drain leaves on kitchen paper
Peel and finely chop the onion. Heat 1 tablespoon of oil in a saucepan. Sauté the onion until transparent. Add rice, mix and add about 600 ml water. Salt the water, cover and let it simmer at low to medium heat for about 20 minutes
Wash the salmon fillet, dab dry and cut into 4 equal pieces. Season with salt and pepper and place each in the middle of a cabbage leaf. Wrap the side over the salmon, wrap and tie together with kitchen string
Heat 1 tablespoon of oil in a frying pan. Fry the roulades for approx. 5 minutes while turning. Season with salt and pepper. Drain the rice. Arrange cabbage roulades and rice on plates