Prosciutto Pizza with Chilled Scallion Cream

1 pkg refrigerated pizza dough 1 Tbsp olive oil 1/3 cup finely sliced red onion 1/2 cup sour cream 2 Tbsp lemon juice 2 Tbsp chopped scallions pepper to taste 1/4 cup chopped red onions 8 slices prosciutto

1. Preheat the oven to 450°F. 2. Roll the dough out into a 10-inch round and transfer to a rimless baking sheet. Brush with olive oil. Scatter sliced onion over the top. Bake until crust is golden, 6 to 8 minutes. Let cool 5 minutes. 3. Mix sour cream, lemon juice, chopped onions and scallions with pepper and spread over cooled crust. 4.Arrange the prosciutto to cover the surface entirely.