Knead flour, butter, egg and 1/2 teaspoon salt to a smooth dough. Roll out the dough on a floured work surface to a circle (26 cm Ø) and place it in a greased tart tin (bottom 19 cm Ø; top 23 cm Ø) dusted with flour.
Press down the edge of the blade. Place the mould in a cold place. Wash, clean and slice the tomatoes. Mix eggs and cream, season with salt and pepper. Crumble 75 g cheese and stir in. Pour into the tart mould, sprinkle bacon over it.
Cover with tomato slices and sprinkle with the remaining cheese. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for approx. 30 minutes. Remove and garnish with rosemary.