Knead the minced meat with 4 teaspoons of tomato paste, breadcrumbs, 1 grated onion, salt and pepper.
Remove the leaves from the Chinese cabbage and cook briefly in salted water.
Take two leaves at a time and spread the mince mixture on top. Shape roulades and wrap with cotton thread.
Chop the other onion and fry together with the roulades in a saucepan with a little oil. Mix the broth with the remaining tomato paste and pour in. Cover and simmer for approx. 15 minutes over medium heat.
Then remove the roulades and keep warm. Mix the tomato sauce with the crème fraiche and season with salt and pepper. Pour the sauce over the roulades and serve.