INGREDIENTS
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3/4 cup extra virgin olive oil
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1/4 cup balsamic vinegar
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1 teaspoon ground cinnamon
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1/4 teaspoon ground nutmeg
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1/8 teaspoon salt
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1 large red onion, cut into 1/8-inch thick rounds (try to keep the rounds intact)
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4 naval oranges
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7 ounces (about 5 cups) baby spinach (or watercress or arugula)