In France, a tartine is slice of bread topped with almost anything—from butter and jam (for breakfast) to cheeses and cured meats (to make open-faced sandwiches). Instead of slices cut from a rustic boule or batard, we use a baguette that has been split open, so these sandwiches are more akin to what the French may call “baguette garnie” or “gondoles.” Whatever their name, this is an easy way to throw together a light dinner. We use average pencil-sized asparagus and cut the spears in half lengthwise so they cook quickly; if you can find super-slender asparagus, simply leave the spears whole. Serve with a vinaigrette-dressed salad to complete the meal.