3 parts light beer
1 part frozen limeade
0.5 parts silver tequila
0.25 parts blue Curacao liqueur (optional, for slightly sweeter, bluer margarita)
2 parts ice
1 lime slice
Slide the lime slice to wet the rim of the serving glass(es), then dip glass(es) in salt.
Pour 2 parts of the light beer equally in the serving glass(es).
Blend the limeade, tequila, the optional Curacao liqueur and ice for about 15 seconds. Add 1 part of the light beer, running the blender for an additional second or two.
Pour the mixture into the serving glasses, stir a little, and serve.