INGREDIENTS
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1 small sweet onion, such as Vidalia, coarsely chopped
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2 medium plum tomatoes, quartered
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1/4 cup fresh lemon juice
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2 tablespoons fresh oregano
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2 cloves garlic, peeled
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1 tablespoon olive oil
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Kosher salt and pepper
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4 boneless, skinless chicken breast halves (about 1 1/2 lb. total), cut into 2-inch pieces
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4 small whole-wheat pitas
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1/2 English cucumber, sliced
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1/4 cup Greek yogurt