Makes 1 litre. Halve your lemons. Squeeze the juice into a bowl – set a sieve over the bowl to catch the pips (throw them out).
Stir in 4 tbsp agave syrup. Add half a vanilla pod, if you like. Make sure you keep the seeds for the banana macaroons.
Pour the juice into a jug. Add 1 litre of water. Give it a good stir. Taste. Add more agave, if you like.
Chill with ice or in the fridge till ready to serve. Freeze any leftovers as ice lollies.
Did you know?
Agave syrup comes from a plant that looks like a pineapple with giant spiky leaves.