For garnishes, unless expressing the oil of a citrus peel is essential to the aroma of your cocktail (like in a Negroni), my "hack" has been to dehydrate citrus

For garnishes, unless expressing the oil of a citrus peel is essential to the aroma of your cocktail (like in a Negroni), my "hack" has been to dehydrate citrus wheels as garnish. You can get ~2-3 wheels out of the middle of every citrus fruit and use the rest for super juice. Plus, they look really cool.