"Serve this meal with warm pita or other flatbread instead of rice, if you like...."
INGREDIENTS
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1 medium red onion, thinly sliced
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2 tablespoons red-wine vinegar
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Coarse salt and ground pepper
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3 boneless, skinless chicken breasts (1 1/2 pounds total), cut into 1-inch pieces
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2 teaspoons finely grated lemon zest, plus 4 teaspoons lemon juice (from 2 lemons)
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2 teaspoons dried oregano
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1/2 English cucumber, halved crosswise and thinly sliced
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2/3 cup nonfat plain Greek yogurt
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1/4 cup chopped fresh parsley leaves
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4 teaspoons extra-virgin olive oil
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1 pint grape or cherry tomatoes, halved (2 cups)
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Cooked long-grain white rice, for serving