Wash, clean and roughly grate the zucchini. Mix with 1/2 tsp salt and set aside. Grate the Gouda roughly. For the dough mix 300 g flour with 1 teaspoon salt and 50 g Gouda. Add 160 g butter in pieces and 6 tbsp. cold water.
Knead first with the dough hooks of the mixer, then with your hands to a smooth dough. Halve the dough, wrap in cling film and chill for approx. 30 minutes.
Put the zucchini in a sieve and squeeze out very well. Clean and wash the spring onion and cut into fine rings. Peel garlic and chop finely.
Heat the oil in a pot. Steam spring onion and garlic for about 4 minutes. Steam the zucchini halfway through. Season with lemon juice and pepper.
Wash the basil and shake dry. Pluck the leaves and chop them roughly. Mix 100 g Gouda, ricotta and egg. Season with pepper and basil. Mix with the zucchini mix.
Preheat oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer). Line a baking tray with baking paper. Divide the dough halves into thirds and roll out round (approx. 15 cm Ø) on the floured work surface.
Place on the tray.
Spread the zucchini mix on the dough pieces, leaving a rim of about 2 cm all around. Fold the edges of the dough over the filling. Sprinkle with the rest of the cheese. Bake in a hot oven for 25-30 minutes.