Wash and halve or quarter the tomatoes. Clean, wash and shake dry the rocket and cut the half roughly. Wash herbs, shake dry, pluck off leaves and chop. Peel and chop onions.
Preheat oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2). Heat 2 tablespoons of oil in an ovenproof pan. Sauté diced onions in it. Add tomatoes and steam for 2-3 minutes.
In the meantime whisk the eggs and season them with salt and pepper. Stir in finely chopped rocket and herbs. Pour the egg mixture into the pan, let it set from below and bake in the oven for 10-15 minutes.
Mix vinegar, salt and pepper, fold in 2 tablespoons of oil. Mix with the rest of the rocket. Cut the omelette into pieces and arrange the rocket on top. Baguette tastes good with it.