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Ingredients

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• 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