Sushi garnish is a type of topping used to enhance the flavor and presentation of sushi dishes. Commonly used garnishes include ROE, which is the eggs of fish such as salmon, flying fish, and herring. ROE is usually served in small amounts as a topping on sushi rolls or nigiri sushi. It adds a salty, briny flavor to the dish and can be served in a variety of colors, including orange, yellow, and black.