Make the dough a day ahead. Put the bread mix in a large bowl. Combine the oil with the warm water in a jug, then tip onto the mix. Stir to a soft dough and set aside for 5 minutes.
Flour the work surface and your hands liberally, to ensure the dough doesn’t stick, then knead the dough for 5 minutes until spongey and soft. Oil a mixing bowl and place the dough back in. Cover with a damp tea towel, and leave to rise. It should double in size.
To make the sauce, simply stir the remaining ingredients together. When ready to cook, heat the oven to its max. Dust a large baking sheet and the work surface with a little flour. Split the dough into two equal pieces. (Do not knead it or it will become too springy.) Roll the dough into large oval shapes, about 300mm long. Lift onto the baking sheet.
Spread the sauce over the bases, then add the dollops of mascarpone, prawns, the Parmesan, sprigs of rosemary, cherry tomatoes, chilli flakes, olives and plenty of seasoning. Add oil to taste – be careful to not add too much. Bake the pizzas for 10-13 mins until the base is crisp and golden, the prawns warmed through and the cheese bubbling. Transfer to a board and serve straight away.
Notes
Why not try to reduce the sauce and make a low-calzone?