Pour raisin juice concentrate into a chilled Pilsner glass. Squeeze lemon juice into glass and stir well. Fill glass with beer and stir again. Garnish with half a wheel of Meyer lemon or lime.
Note: To make concentrate, boil 1 cup natural raisins and 1 cup water in a small saucepan for 10 minutes. Remove from heat and let cool. Purée in a blender and strain. Refrigerate before using.