They are pretty simple.
The basic ingredients for 1 serve (which should be served in a high-baller) are:
Half a lime (cut into wedges).
4 tsp of castor sugar.
Approximately 10 large mint leaves.
1.5 oz of Bacardi (75 ml)
Soda water.
Lots of crushed ice.

You’ll need a shaker and something to muddle with. Like a rolling pin or mortar.

Instead of castor sugar, you can make a simple/sugar syrup.
Which is 1 part sugar 1 part water.
So you would take 2 cups of water, pour them in a saucepan. Bring it to a simmer, dissolve 2 cups of sugar in the water. Allow to cool and pour into a bottle.
You would use 1 tbsp of sugar syrup instead of the 4 tsp of castor sugar.


Place lime in shaker, sprinkle with sugar.
Muddle, add mint. Muddle.
Add Bacardi and a small amount of ice and shake.
Fill the glasses half-way with crushed ice.
Pour the contents of the shaker over the ice and spoon in the lime and mint.
Add a dash of soda water.
Give it all a stir.
Top with ice, garnish and serve!

If you’re only making 1 or 2.
Before you add the mint, take each leaf and clap it in the palm of your hands.
It releases the oils.
It does make a difference, but it’s a pain the the arse if you’re making batches.