For a sweeter sangria, add a tablespoon or two of simple syrup. If you prefer a less sweet sangria, reduce the amount of orange liqueur. Feel free to experiment with other fruits such as apples, pears, or cranberries for a seasonal twist. The longer the sangria sits, the more the flavors will meld together. However, be mindful that the citrus rinds can become bitter if left to infuse for too long (more than 24 hours). Chill your glasses ahead of time for an extra refreshing experience.