Peel and finely chop the onion. Peel garlic. Wash the tomatoes. Wash the rosemary and dab dry. Heat butter in a pot and fry onion. Add cream and peas, season with salt and pepper.
Cover and simmer on low heat for 8-10 minutes. Wash the meat and dab dry. Heat oil in a pan. Add meat with garlic and rosemary to the pan. Fry meat on each side for 2-3 minutes. Season with salt and pepper, take everything out of the pan and wrap in aluminium foil. Put the tomatoes in the hot frying oil and braise them for 2-3 minutes. Season with salt and pepper. Puree peas in the cream with a blender. Wash mint, dab dry and cut into fine strips. Mix mint, except for 1 tablespoon, into the puree. Season everything once again.
Put the tomatoes in the hot frying oil and braise them for 2-3 minutes. Season with salt and pepper. Puree peas in the cream with a blender. Wash mint, dab dry and cut into fine strips. Mix mint, except for 1 tablespoon, into the puree. Season everything once again. Serve the puree with lamb and tomatoes. Sprinkle with set aside mint