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Turn grill to high and preheat.
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Rub the avocado, onion slices, one half lime and jalapeño with olive oil. Place avocado cut side down on grill. Cook about 3 mins or until slightly charred.
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Place jalapeño, onion slices and one half of the lime on grill. Close the grill and cook, turning occasionally, about 5 minutes. Remove and allow to cool slightly.
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Hold the avocado half in your hand and cut through in a cross hatch, without cutting through the skin. Scoop out into a bowl. Repeat with the other half.
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Chop the onion and jalapeño and add to the avocado.
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Squeeze the juice from both halves of the lime (grilled and fresh) onto the avocado mixture. Add the tomato, cilantro, salt and stir together to combine.