12 oz ale
1 oz brandy
1 oz lemon juice
1 egg yolk
1 tbsp granulated sugar
1/4 tsp ground ginger

Heat the lemon juice with 2 ounces of ale, the ginger and the sugar in a saucepan over moderate heat until the sugar has dissolved. Beat the egg yolk into the brandy in a bowl. Beat the lemon juice mixture from the saucepan into the bowl with the egg, and beat together. Transfer to a beer mug. Add the rest of the ale, stir well, and serve.