INGREDIENTS
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3 tablespoons olive oil
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2 medium onions, chopped
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kosher salt and black pepper
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1 16-ounce container sour cream
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1 10-ounce package frozen chopped spinach, thawed and squeezed of excess liquid
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1 tablespoon white wine vinegar
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broccoli and cauliflower florets, endive spears, and radishes, for serving