"Served with a green salad, this would be a great quick supper...."
INGREDIENTS
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4 tablespoons olive oil, divided
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4 cups thinly sliced red onions
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1 tablespoon golden brown sugar
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1/4 cup balsamic vinegar
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Pinch of dried crushed red pepper
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4 1/2-inch-thick slices crusty bread (each 4x6 inches)
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8 thin slices prosciutto
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1 cup fresh ricotta cheese
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Fresh rosemary sprigs