You can garnish your glasses for an extra touch of elegance with a thin slice of fresh lemon or a sprig of fresh mint.[cite: 1] The simple syrup can be made well ahead of time and stored in an airtight jar in the refrigerator for up to three weeks.[cite: 1] Leftover lemonade can also be stored covered in the refrigerator and will remain bright and fresh for about five days.[cite: 1]