Halve the heart, wash it well and cut into slices, season with salt, pepper, thyme and marjoram. Sauté the chopped bacon and add the heart with the finely chopped onion and grated garlic and roast. Add the soup greens cut into fine strips, pickles and tomato paste and roast briefly. Fill up to a finger high with water. Cover and cook slowly for about 1.5 hours until soft. Add the finely chopped potatoes and cook until the potatoes disintegrate.