Make the lemon syrup

• Add the sugar, water, lemon peel and lemon juice to a saucepan over medium heat.
• Heat gently, stirring until the sugar dissolves and the syrup thickens slightly.

Infuse and strain the syrup

• Remove from the heat and let the lemon peel infuse.
• Strain the syrup and allow it to cool completely.

Blend the watermelon and mint

• Add the watermelon cubes and mint leaves to a blender.
• Blend until completely smooth.

Assemble the lemonade

• Add ice cubes, lemon slices, mint and the lemon syrup, then stir well.
• Add a little cold water if you prefer a lighter consistency.

Serve

• Serve chilled with extra watermelon cubes on top.