Peel onion and garlic and dice both. Heat 1 tablespoon of oil in a saucepan. Sauté garlic and onion cubes until translucent. Stir in tomato paste. Add canned tomatoes and reduce everything to a thick sauce for about 15 minutes. Season to taste with salt and pepper.
Wash the wild garlic and dab dry. Roast the pine nuts in a small pan without fat until golden brown, take them out. Put 1 teaspoon of pine nuts aside. Coarsely pluck the wild garlic and finely chop it with the remaining pine nuts, 2 tablespoons of olive oil and 25 g of parmesan in the universal chopper. Season pesto with salt, pepper and a little lemon juice. Peel and halve the red onions and cut them lengthwise into strips. Wash, clean and slice the tomatoes. Lay out the pizzas on a floured work surface and spread with tomato sauce. Cover pizzas with tomatoes and strips of onion. Mix Gouda and 50 g parmesan and spread on the pizzas. Put some blobs of pesto on the pizzas.
Peel and halve the red onions and cut them lengthwise into strips. Wash, clean and slice the tomatoes. Lay out the pizzas on a floured work surface and spread with tomato sauce. Cover pizzas with tomatoes and strips of onion. Mix Gouda and 50 g parmesan and spread on the pizzas. Put some blobs of pesto on the pizzas. Bake the pizzas in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for about 20 minutes. Sprinkle the pizzas with 1 teaspoon of pine nuts