"A little tenderizing and marinade make this chicken breast patty so flavorful, you won't miss the beef (or the calories, for that matter)...."
INGREDIENTS
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1 cup low-sodium soy sauce
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1 cup pineapple juice
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3/4 cup packed brown sugar
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1/2 teaspoon grated ginger root
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1 clove garlic, grated
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Four five-ounce portions skinless, boneless chicken breast
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1 tablespoon vegetable oil, plus more for brushing and grill
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1 medium red onion, sliced
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1/4 teaspoon kosher salt
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8 pineapple rings (canned or fresh)
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4 hamburger buns
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Green leaf lettuce