Clean and wash the pointed cabbage and cut strips. Peel and finely chop the onion. Heat the fat in a pot and fry the diced onion until transparent. Add pointed cabbage, braise and pour on broth. Steam covered for about 5 minutes.
Mix cream, sauce thickener, lemon juice and zest. Pour into the pointed cabbage, cover and simmer for another 5 minutes while stirring. Season pointed cabbage with salt, pepper and lemon juice and arrange on plates. Serve garnished with lemon balm, lemon slices and julienne