Make tomato sauce first: fry red onion until soft first before adding chopped garlic. Add passata or organic chopped tomato and herbs. Cook until it thickens a bit (to spread it on a pizza base it shouldn't be too runny as it will make base soggy).
Brush the pizza bases with some olive oil (to prevent it from becoming soggy) and spread cooked tomato sauce on top.
Add sliced mozzarella cheese and the veg: mushrooms, tomatoes, olives, red onions.
Sprinkle the pizza with plenty of oregano.
Bake the pizza on 220 degrees for 10 minutes or less depending on your oven.
Just before the pizza is ready, add some pine nuts on top and roast them for a minute or two. Be careful though as they can go brown very quickly.
Once the pizza is ready, scatter over the spinach leaves and serve with a side salad.