INGREDIENTS
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1 1/2 pounds sweet potatoes
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Salt, preferably sea salt
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1 large red onion, halved and thinly sliced, or 1 bunch scallions, sliced
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2 bunches fresh arugula, trimmed and coarsely chopped
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1/2 cup Greek extra virgin olive oil
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3 to 4 tablespoons red wine vinegar (to taste)
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1 cup crumbled Greek feta cheese or goat cheese (optional)