Peel and finely chop the onion. Clean and wash the tomatoes and cut them into fine slices. Melt 1 tablespoon butter. Sauté onion in it. Add the tomatoes and stew for 5 minutes. Season with salt and pepper.
Deglaze with 800 ml water, stir in stock and tomato paste. Simmer covered for about 20 minutes. In the meantime wash and chop the herbs. Cut white bread into cubes. Fry in 1 tablespoon of hot butter, turning until golden brown.
Whip cream until semi-solid, stir in gin. Crush juniper berries. Season soup with salt, pepper and crushed juniper, stir in herbs. Serve the soup with the gin cream and croutons.