Savory Penne with Lentils and Kale

Ingredients

• ½ cup brown lentils
• 1 tablespoon (15 milliliters) light olive oil
• ½ cup onion, chopped
• 1 teaspoon garlic, minced
• 2 cups dry whole-wheat penne pasta
• 1½ cups (360 milliliters) canned crushed tomatoes
• ¼ teaspoon salt
• ⅛ teaspoon black pepper
• ½ teaspoon dried oregano
• ½ teaspoon dried basil
• 1 cup frozen kale, chopped
• ¼ cup walnuts, chopped
• 2 tablespoons fresh parsley, for garnish