Place a sieve over a bowl. Tip 1 can peeled plum tomatoes into the sieve. Strain off the excess liquid from the tomatoes (you can save this for a pasta dish!).
Add the strained plum tomatoes to a bowl. Use clean hands to crush the tomatoes into a sauce. It doesn't have to be smooth.
Place 1 pinsa base on a large oven or pizza tray.
Use a spoon to spread the crushed tomato sauce over the pinsa base. Leave a gap on the edge of the pinsa base, to make a "crust."
Slice 120 grams block mozzarella into crescents. Arrange on top of the tomato base.
Finely grate 10 grams vegetarian pecorino over the pinsa.
Drizzle the pinsa margherita with 1 tablespoon extra virgin olive oil, then sprinkle with fine sea salt to taste. Add ½ sprig fresh basil, with the leaves roughly torn/chopped, on top.
Bake the pinsa margherita for 5 minutes, or until the crust is golden and crisp, while the cheese is bubbly and melted. Once cooked, serve with the remaining ½ sprig fresh basil scattered over the surface.