"Optional garnishes" refers to additional decorations or toppings that can be added to a dish, but are not necessary or required for its basic preparation. Full definition
Heat through, and serve immediately topped with cashews and optional garnish of additional Thai basil. (thebloomingplatter.com)
Top with optional garnishes of grated orange zest and chopped parsley. (thefitfork.com)
You'll need frozen banana, pineapple juice, coconut or almond milk, ground turmeric, and shredded coconut and fresh turmeric root as optional garnishes. (detoxdiy.com)