It's in nearly every dish we cook, yet few ingredients inspire as much debate as salt. Kosher salt or sea salt? Which one belongs in your kitchen, and does it really matter? Mark Kurlansky, in Salt: A ...

Celtic salt is sea salt. It’s also called “sel gris” or “gray salt” because of its gray color, which comes from the extra minerals: magnesium, calcium, potassium, zinc, and iron. A grain of Celtic ...