Cook 4 ounces chopped prosciutto in a skillet with 2 tablespoons olive oil over medium heat until crisp, 4 minutes. Stir in 3 sliced garlic cloves and 1 tablespoon tomato paste; cook 1 minute. Ladle in 1 cup pasta-cooking water and simmer until reduced by half, 4 minutes. Add 1/4 cup heavy cream and simmer until thickened, 3 minutes. Toss with 1 pound cooked ravioli, 1 cup blanched frozen peas and some chopped parsley. Top with grated parmesan.