Method
1. Add dried black beans to a clean saucepan and cover with water
2. Bring to boil and cover
3. Boil vigorously - 10 min
4. Drain using a strainer
5. Heat olive oil in a clean saucepan
6. Add onion and fry until softened while stirring occasionally - 5 min
7. Add carrot, celery stalk and garlic clove
8. Fry - 3 min
9. Stir in fennel seeds, cumin seeds, coriander seeds and smoked paprika
10. Cook - 1 min
11. Pour content of saucepan into slow cooker bowl
12. Add canned chopped tomatoes, vegetable stock, brown sugar and salt & pepper to the saucepan
13. Transfer beans to stew and cover
14. Bring to boil in a saucepan
15. Cook stew in slow cooker - 10 hr, low heat
16. Season with salt & pepper
17. Transfer stew to medium bowl
18. Top with plain yogurt
19. Serve with rustic french bread