Watermelon-Berry Salad With Chile Dressing and Lots of Herbs

Ingredients
Method
Combine all the dressing ingredients in a blender and blend on high speed until smooth, about 2 minutes. It keeps in an airtight container in the fridge for up to 3 days. Shake well before using.
Cut the watermelon into 3 x 1 x 1-inch sticks, flicking out seeds as you go. You will have about 6 cups. Chill the watermelon in the fridge for at least an hour.
Combine the chilled watermelon and onion in a large mixing bowl and season all over with the flaky salt. Add the berries, lemongrass, and dressing, then toss gently but well. Drizzle on the olive oil, add the herbs, and gently toss once more. Transfer to a platter to serve.