Dinner Tonight: Linguine with Mussels and Kale Recipe

Name: Dinner Tonight: Linguine with Mussels and Kale Recipe
Ingredients: 3/4 pound linguine; Salt; 6 tablespoons extra-virgin olive oil; 1 onion, quartered, and thinly sliced crosswise; 2 garlic cloves, thinly sliced; 1/2 teaspoon crushed red pepper; 2 pounds mussels scrubbed and debearded; 6 large kale leaves, stems and ribs discarded, chopped