Vichyssoise garnish is a classic French soup garnish made from CHIVES or CHIVE. CHIVES are a type of onion that have a milder flavor than regular onions and are often used as a garnish for soups, salads, and other dishes. CHIVES are also known for their bright green color, which adds a nice contrast to the creamy texture of vichyssoise. The use of CHIVES or CHIVE as a garnish for vichyssoise adds a subtle flavor and visual appeal to the dish.