Mix 400 g flour, sugar, 1 tsp salt and yeast. Add 1/4 l lukewarm water and 2-3 tbsp. oil and knead everything into a smooth dough. Cover and leave to rise in a warm place for about 30 minutes
Clean, wash and drain the spinach. Peel onion and garlic. Dice onion finely and cut garlic into thin slices. Fry both in 1 tbsp. hot oil. Add the spinach and let it collapse. Season with salt and pepper
Knead the dough again and divide into 4 portions. Roll out each portion to a round shape (approx. 15 cm Ø) on a little flour. Place on a baking tray lined with baking paper and leave to rise for a further 10-15 minutes
Mix tomato paste and strained tomatoes. Season with salt and cayenne pepper. Drain the spinach if necessary. Drain mozzarella, quarter it and cut it into slices. Rinse shrimps
Spread the pizzas with tomato sauce and top with spinach, cheese and shrimps. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: level 3) for approx. 20 minutes