Buttered Radish Tartines (Tartine Radis-Beurre)

These open-faced sandwiches, or tartines, are a great way to serve the quintessential Gallic flavor combo of butter and radishes. You can use firm, fresh radishes of any variety, such as round red radishes or Easter Egg radishes. Use a good rustic loaf or a freshly baked baguette. Let guests make their own, offering sweet butter or the following savory olive butter.