Lentil Soup with Sausage, Chard and Garlic

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Ingredients

1/2 cup olive oil, divided
2 large links (about 8 ounces) of sweet Italian sausage, casings removed [see Note]
1 medium onion, diced
2 celery ribs, sliced or diced
2 medium carrots, peeled and sliced into half-moons or diced
4 cloves garlic, sliced (reserve half for later in recipe)
Kosher salt
A pinch of crushed red pepper flakes (optional)
1 cup brown lentils, sorted and rinsed
2 bay leaves
1 28-ounce can crushed tomatoes
6 cups water
Freshly ground black pepper
3 to 4 cups shredded or thinly ribboned Swiss chard leaves or kale
Grated Pecorino Romano cheese to finish

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