Zesting leftover lemon peel into a chicken stir-fry adds extra flavor and complexity.
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Heat a large skillet over medium-high heat. Add the oil and then stir in the onions and garlic. Cook for about 2 minutes or until the onions are soft.
Add the chicken and sweet peppers, stirring occasionally, cook until the chicken is lightly browned and cooked through, 5 to 7 minutes.
Stir in the lemon zest, lemon juice and brown sugar. Season with salt and pepper and serve warm.