Hearty lentil, pesto and Colby soup

Ingredients

• 1 tbsp (15) butter
• 1 onion chopped
• 2 celery stalks finely sliced
• 1 large carrot diced
• 2 cups (500 mL) sodium-reduced vegetable or chicken broth
• 1 can (540 mL) diced tomatoes
• 1 cup (250 mL) green cabbage cut into pieces
• 1 cup green and/or yellow beans cut into 1˝ (2.5 cm) lengths
• 1 can (540 mL) green lentils rinsed
• 2 tbsp (30 mL) homemade or store-bought pesto
• 1 1/2 cups (375 mL) Canadian Colby grated or diced