Peel and halve the onion. Bring 1/2 litre water and 1 teaspoon salt to the boil. Add onion, caraway and 1 bay leaf. Add eggs and cook for 10 minutes. Wash the herbs and pluck into small twigs.
Drain eggs, quench and peel. Layer eggs and herbs in a glass. Boil 300 ml water and 1 teaspoon of salt. Fill the glass with it and close it. Leave to soak for 1-2 days. Serve with onion baguette, herb butter and tomato.