Mix yoghurt and mayonnaise. Peel garlic and press it directly into the yoghurt. Season to taste.
Drain the artichokes. Dab dry well and cut in half. Wash lettuce and tomatoes. Pluck lettuce possibly smaller. Halve the tomatoes.
Fry the artichokes in 1 tablespoon of hot oil for about 4 minutes. Season with lemon zest, salt and pepper. Leave to cool. Whip vinegar, salt, pepper, some sugar and 2 tbsp. oil.
Mix salad, tomatoes and vinaigrette. Serve with artichokes and garlic sauce. Serve with baguette.