Orange peel is added to any beverage for flavor and its aromatic qualities, generally in the last few minutes of a beer wort boiling and should be strained out before bottling. Some brewers add coriander and some other flavoring to the primary fermentation vessel to get a stronger flavor.
Sweet orange peel has a brighter orange color and has a relatively thin peel compared to bitter orange and when added in similar quantities to bitter orange peel, it gives a beers a strong orange flavor. Sweet orange peel is combined with coriander in some Belgium beers, used in holiday ales, and as an aromatic ingredient in some wines.
When brewing with malt extracts, the orange peel and other spices can be added to a muslin bag for easily removal before the wort is put into the primary fermenter.
Orange peel often used in combination with coriander and cardamom in Belgium Witbier, or white beers.