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Heat oven to 220C/200C fan/gas 7. Place a flat baking sheet in the oven to heat up. Spread 2 tbsp tomato sauce on each pizza base. Carefully slide the bases onto the baking sheet and cook following pack instructions.
Five mins before the cooking time is up, scatter over the ham, dot the ricotta on top in spoonfuls and continue cooking. Season and drizzle the pesto over each pizza.