Ginger beer is a classic cocktail ingredient that adds a strong, spicy ginger finish to cocktails. Ginger beer is definitely one of the most versatile cocktail ingredients there is. For example, it can be used in a G&T to give a bittersweet flavour and to help mask the bitterness of the gin. Moscow Mules beautifully blend with the other liquors to give a spicy flavour and a little kick of ginger. Ginger beer can be substituted for fresh ginger in a pinch. In fact, ginger beer and fresh ginger are very similar. The main difference is that ginger beer has sugar added to it. It also tends to be a little more carbonated, giving the cocktail a bolder taste and the sparkle of ginger beer is perfect in a cocktail.