There are two different type of alcoholic substances used in drinks. Liquors and Liquers. Liquors are anything 80% and above in alcohol content. Liquers are anything under 80% in alcohol content. There is a simple rule you follow if both liquor and liquer are used in the same drink. Liquor is always 1 1/4 ounce, which is the large side on your jigger, or more known as a "shot". The liquer will be 1/2 ounce everytime, which is the small side of your jigger. This rule applies to the drink if it has BOTH of them in it. Otherwise, follow the recipe.