Boil 400ml (13½fl oz/1½ cups + 1 tbsp) water and pour into a jug. Add the oolong tea, stir, cover and allow to cool and infuse. Once cool, strain, cover and chill in the fridge until needed.
Meanwhile, add the peaches, honey and lemon juice to a small saucepan and place over a low-medium heat for 5 minutes, or until the peaches have softened considerably. Remov