This idea popped into my head out of blue and I decided to try it on these days of World Cup Games ...
and it worked!
It was a delight and I ... got drunk.
Juice of half lime
Juice of half lemon
2 shots of cachaça (brazilian rum)
half a glass of ice water
1 tablespoon sugar
Squeeze the juice of the lemons into the Cup.
Add the water, the rum and the sugar and stir well.
Add ice and stir again.
Garnish with lime and lemon slices and serve.
If you want to do the traditional way, it's all right.
If you don't like rum, you can also use vodka and you'll have a caipiroska.