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Squeeze the lemon juice over the onion and mix well. Leave to marinade for 5 minutes or so while you prepare the remaining ingredients
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Remove the mint stalks and gently tear the leaves up
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Mix the watermelon, tomato and mint leaves with the onion.
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Crumble in the feta and dress with a teaspoon of the best extra virgin olive oil you have. If you like, you can add a few black olives