Mushroom caviar is a flavorful and gourmet spread made from finely chopped or pureed mushrooms. It is often seasoned with a variety of ingredients such as garlic, onions, herbs, and sometimes butter or cream to create a rich, savory taste. Mushroom caviar is typically used as a topping for crackers, toast, or as a filling in pastries, and it pairs wonderfully with meats, cheeses, and even on its own as a luxurious appetizer.