Black Bean and Kale Soup

Ingredients

• 1/2 lb to 1 lb kale (, thickest part of stem removed and roughly chopped)
• 1 large leek (, diced)
• 1 large onion (, diced)
• 2 garlic cloves (, minced)
• 5 cups good quality chicken or vegetable stock
• 1 can whole or diced tomatoes
• 3/4 lb black beans (, soaked overnight then cooked until tender)
• salt and pepper to taste
• 1 lb sausage (, spicy or not, cut into chunks)
• 3 tbsp olive oil