Ingredients

· 1-2 medium watermelons

· 250 ml lemon juice

· 100 g golden caster sugar

· 1 litre bottle soda water

· 1 lime, cut into slices

· Small handful mint

· Crushed ice

Method

Cut the top off the watermelons and hollow them out using a large spoon, fishing out any pips along the way. Mash the flesh through a sieve into a bowl. Put the flesh in a blender (or use a tall jug and hand blender) with the lemon juice and sugar, whizz to a purée, then stir in the soda. Heap some ice into the hollowed-out watermelons and fill it with the lemonade mixture. Serve the rest in a jug with the lime slices and mint. Also, have a bowl of extra crushed ice on the side.