Puff pastry pizza

400g of store-bought puff pastry, defrosted and rolled-out to the shape and size of a sheet pan

For the sauce:

good quality tomato sauce,

pesto or crushed garlic

small handful of cherry tomatoes

2 slices of chorizo

½ red onion, sliced thinly

100g Gruyère

100g Parmesan, grated

black pepper