Watermelon and herb gazpacho

With no fat or carbs, this is an almost kilojoule-free liquid lunch. Ingredients500ml (2 cups) watermelon cubes1 small English cucumber, seeded and sliced1 small red onion, finely chopped1 stalk lemon grass, finely choppedHandful fresh mint leavesHandful fresh coriander, chopped1 red chilli, seeded and chopped250ml (1 cup) Italian passata60ml (cup) rice vinegar3-4 lime or 2 lemon leaves, finely sliced100ml lime juice45ml (3 tbsp) fish sauceSalt and white pepper, to tasteMethodCombine all ingred...