For a twist on the standard potato gratin, consider cnevertz's Sweet Potato and Pancetta Gratin from the new Food52 Cookbook. The dish is a simple one with only six ingredients (including salt and pepper), but each element packs a punch. The Gruyère's funky flavor cuts the sweetness of the potatoes and richness of the cream, and the diced pancetta contributes its own salty, sweet, and spicy notes. The most unique part about this gratin, however, isn't in the ingredient list. Instead of shingling the potatoes in a large baking dish, cnevertz layers individual servings in a muffin tin, making for a button-cute finish to this easy side.