Pasta With Lentils and Mushrooms

Ingredients

• ¼ cup olive oil
• 1 medium onion, finely chopped
• 8 oz. crimini mushrooms, stems trimmed, chopped into ¼" pieces
• 1 tsp. kosher salt, plus more
• 2 garlic cloves, coarsely chopped
• 1 cup brown lentils, rinsed
• ¼ cup double-concentrated tomato paste
• ½ tsp. crushed red pepper flakes
• 10 oz. orecchiette or conchiglie
• 1½ oz. Parmesan, finely grated (about ½ cup), plus more for serving
• 3 Tbsp. unsalted butter, cut into pieces
• ½ cup coarsely chopped parsley, plus more for serving

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