Preheat the oil in a skillet over a medium heat and gently fry the onions for 4-5 minutes until softened. Stir in the BBQ sauce, vegetarian Worcestershire sauce, ketchup and mustard and heated until warmed through. Add the Quorn Mince and sweetcorn and continue to cook for 2-3 minutes. Remove from the heat.
Place the pizza bases on a baking sheet, brush with the tomato puree and sprinkle over a quarter of the grated cheese. Pile on the Quorn Sloppy Joe topping and top with the remaining grated cheese.
Bake for 15-20 minutes until golden brown, remove from the oven and scatter a few rocket leaves over.
Enjoy with a tomato and basil salad. For a spicy alternative, try replacing half of the BBQ sauce with Sriracha Sauce. Any leftover BBQ sauce can be stored in an airtight container and kept in the refrigerator for up to 2 weeks.