Slow Cooker Lentil and Mushroom Bolognese

Name: Slow Cooker Lentil and Mushroom Bolognese
Ingredients: 8 ounces baby bella or cremini mushrooms, finely chopped; 2 celery stalks, finely chopped; 2 carrots, finely chopped; 1 small onion, finely chopped; 2 garlic cloves, minced; 1 cup small dried green lentils; 1 cup vegetable broth; 1/2 cup red wine; 2 ounces tomato paste; 1 (28-ounce) can crushed tomatoes; 2 bay leaves; 2 teaspoons kosher salt, plus more for seasoning; 1/4 teaspoon freshly ground black pepper, plus more for seasoning