With refreshing mint and lime plus optional feta, this quick and easy salad is a great side dish for spicy or barbecued food and as a light main course or lunch on hot summer days.
Make the dressing first: put all the ingredients into a lidded jar and shake well to combine. Taste and add more seasoning if needed.
Put the prepared watermelon, cucumber, red onion, whole mint leaves and lime zest into a serving bowl.
Can be prepared in advance up to this stage, covered and chilled for 2 hours if necessary.
Shake the dressing again then pour over the salad and toss gently.
Cover and chill in the fridge for 20 minutes to allow the flavours to meld.
Toss in the feta cheese if using and serve.