Peel and chop the garlic and onion. Clean and wash the spinach. Heat oil in a pan. Sauté onion and garlic until translucent. Add spinach and 2-3 tbsp. water.
Collapse the spinach and season with salt, pepper and nutmeg. Wash and halve the tomatoes. Place flat bread on a baking tray lined with baking paper. Spread with tomato ketchup. Cover with tomatoes and spinach.
Grate the cheese and sprinkle over it. Bake in the preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: level 4) for approx. 7 minutes. Remove, cut into pieces and arrange.