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In large nonstick skillet, melt butter over medium heat.
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Add chicken breasts; cook 5 minutes until golden brown.
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Turn and cook an additional 5 minutes.
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Add water and shallots.
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Reduce heat to medium-low and cook 10 minutes.
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Remove chicken from skillet; keep warm.
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Add raspberry vinegar to skillet; bring to boiling and cook 2 minutes.
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Stir in tomatoes, tomato paste and chicken stock.
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Simmer until sauce thickens slightly.
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Return chicken to pan, turning to coat well.
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Reduce heat to low; cook 10 minutes.
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Arrange chicken pieces on a warm serving platter; pour sauce over the top.
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Sprinkle with raspberries and chopped chives.