I usually just drink beer and have a shot or three with it, but Mrs. Irish and I were both wanting something summery to drink the other night and I came up with this and it is surprisingly good and not too sweet or sour. Some Margarita mixes are off the chain either too sweet or too sour. This is just right and the beer adds a nice fizz.

Fill a glass with ice and add
1 shot of Tequila (I think a reposado is best for this.)
1/2 shot of Grand Marnier (Another brand of orange liqueur would probably work too, but this is what I had on hand.)
1 lime wedge squeezed into the glass
Fill the remainder of the glass with about 1/2 a beer (I used Modelo Especial for this, but any light lager style beer should work.)

Stir and enjoy...

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