For this recipe, we recommend using a loaf of sourdough bread from the bakery section of your grocery store (rather than pre-sliced sandwich bread). The bakery sourdough will typically be heartier, which is ideal for holding a lot of toppings. This also allows you to cut the slices at the exact 3/4-inch thickness (you want the bread to be toasted on the outside but soft and pillow-y on the inside). You can cut the tartines into smaller, bite-sized pieces and serve them as canapes.