Source: Bartender's Manual or How To Mix Drinks of the Present Style page: 87
1/2 large bar glass ale
Ingredient: aleWhat it is: Beer
Ale is a type of beer brewed from malted barley using a top-fermenting brewers' yeast.
1/2 large bar glass ginger ale(Use a large bar glass or mug.)
Ingredient: ginger aleAlso Known As: ginger beer What it is: Additive
Carbonated soft drink that is flavored primarily with ginger, lemon, and sugar. It is rarely produced as an alcoholic beverage. A simple version of this recipe can be made at home today in which grated fresh ginger, sugar, a small amount of baker's yeast, and (optionally) lemon juice is bottled in a 2 liter bottle. It is sealed at room temperature to fermet for a day or two before refrigerating.
Fill the glass half full of Old Ale or Bass Ale, and the other half with Belfast Ginger Ale; stir up with a spoon, and serve.