To a blender add all of the dressing ingredients (lemon juice, watermelon, garlic clove, minced red onion, chili flakes, salt and olive oil) and pulse / blend until fully combined and smooth.
Add the cucumber slices, feta cubes, sliced red onion and green olives to a medium-large mason jar and pour the watermelon dressing over top. Put a lid on an gently shake the jar to make sure everything is coated.
Store in the fridge for up to 5 days. Enjoy as a topping on bread; on fish; or an a part of an appetizer board.
Video
Notes
Add the marinated olives, feta, onion and cucumber to a Cheeseboard
Try using the watermelon dressing as a dressing to a favourite green salad instead of marinating vegeables