Dab the fillet dry and season with salt and pepper. Heat 1 tablespoon of oil in an ovenproof pan or in a flat roasting pan. Sauté the fillet for about 5 minutes. Cook in a hot oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2) for approx. 20 minutes.
Wrap in foil and let rest for about 10 minutes.
Wash the tomatoes. Cut half into slices and spread on a plate.
For the tomato sauce, whisk vinegar, honey, salt and pepper. Fold in 1 tablespoon of oil. Grate the remaining tomatoes coarsely or dice finely. Peel onion and cut into fine cubes. Wash the thyme and keep some for garnishing.
Pluck the rest. Mix everything and season to taste.
Cut the meat into thin slices and arrange on the tomato slices. Drizzle with tomato sauce and garnish with the rest of thyme. Cut the baguette into slices and serve.