Prosciutto Palmiers Recipe

"Store-bought puff pastry is a great thing to have in your freezer for easy, last-minute party snacks like this savory version of palmiers, a classic French pastry. Just brush tomato paste over the thawed pastry, layer on some salty prosciutto, sprinkle with nutty Gruyère cheese, and bake until flaky and golden brown. What to buy: Be sure to look for an all-butter puff pastry (the flavor is superior); avoid brands made with partially hydrogenated shortening. We like Dufour, which can be found in the freezer section of many specialty grocery stores, including Whole Foods. Special equipment: You’ll need a pastry brush for this recipe...."