When & Why Should You Use Fleur De Sel?
Because of its delicate nature and higher price relative to other salts, fleur de sel isn't meant for seasoning a dish while you cook it. If you expose it to high temperatures, it will melt and lose its unique character.
Instead, you should use sprinkles of fleur de sel on anything that needs a little extra oomph right before it's consumed: salads, fish, meat, fruit, vegetables, and dessert. Some even sprinkle it on their oatmeal (guilty).