In a sauté pan, heat the butter, add the shallots and prosciutto and shallots. Sauté for 2 minutes or until shallots turn light brown. Add the tomato puree and sauté for a few minute to caramelize all the ingredients together. Add the Vodka and stir, then ignite with a match (optional). When flames subside, add the chopped tomatoes, cream and precooked pasta let reduce for 3 to 4 minutes or until the cream thicken slightly.