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Peel and halve the red onion and cut into very find half-moons and put in a small bowl.
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Add the juice of at least 2 limes, and if there doesn't seem to be enough juice, add more. Let steep a good 1/2 hour.
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In the meantime, remove the rind and seeds from the watermelon, and cut into approximately 1 1/2 inch or so cubes (large bite sized)
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Cut the feta into similar size.
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Put both the melon and feta in a large wide, shallow bowl.
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Tear off the leaves of parsley. Do not chop- these are your 'lettuce"! Add it to the bowl.
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Chop the mint and add it to the bowl.
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Pour the onions and the juices over everything.
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Add the oil and the olives. Use your hands to toss everything very gently. You don't want to crush or mush up the feta and melon.
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Add a good grinding of black pepper.