Step 1

Slice 3/4 of a seedless watermelon into cubes, reserving one quarter for juice, and place in a bag and freeze for several hours or preferably overnight.

Step 2

In a strainer over a bowl, press the remaining chunks of fresh watermelon with a muddler or flat surface until most of the juice is extracted.

Step 3

Slice limes into quarters and squeeze the juice of one fruit into each serving glass, throwing the limes into the glass along with it. (Only use half of a lime instead of 2 medium limes if you prefer a drink that's not as tart.)

Step 4

Add 1 tbsp sugar and one shot (2 Tbsp // 30 ml) of white rum to each serving glass and muddle until well mixed.

Step 5

Fill to the brim with watermelon ice cubes, add a healthy splash of watermelon juice (about 1/4 cup), and top off with club soda.

Step 6

Stir, garnish with lime wedge, and serve with a straw.