INGREDIENTS
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2 tablespoon extra-virgin olive oil, plus more for drizzling
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1 onion, diced
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1 stalk celery, sliced
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1 carrot, peeled and diced
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8 ounces Yukon Gold potatoes, scrubbed and cut into 1-inch pieces
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Coarse salt and freshly ground pepper
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1 bunch kale, stems removed, leaves torn into small pieces (4 cups)
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1 (15-ounce) can navy beans, drained and rinsed
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2 teaspoons red-wine vinegar