Easy Crockpot Lentil Soup

Ingredients

• 1 pound brown lentils, rinsed
• 1 pound smoked sausage, cut into circles
• 2 stalks celery with leaves, minced
• 1/2 onion, minced
• 1 large carrot, minced
• 20 ounces crushed tomatoes
• 5 to 6 cups chicken or vegetable stock
• 5 sprigs thyme
• 2 bay leaves
• 1 teaspoon salt
• 1 teaspoon black pepper