Cut 1 of the limes into small chunks, then place the pieces in the bottom of a sturdy tumbler.
Add half of the sugar.
Crush really well with a muddler. Alternatively, you can do this with a pestle and mortar.
Top up the tumbler with crushed ice.
Add half of the vodka, then stir well to mix all the ingredients together.
Repeat to make the second cocktail.
Enjoy, and please remember to drink responsibly.
2 servings