Place stewing beef, beef stock and salt and pepper in crock pot on low for 3 hours or until tender.
At the 3 hour mark, drizzle some olive oil in a pan. Sauté over med-high heat, the onion, celery, bell pepper and garlic until softened, 3-4 min.
Add all spices to the onion and celery mixture (cumin, curry, coriander, lemon juice, ginger). Add tomatoes and their juices. Transfer all of that goodness over to the beef in the crockpot.
Add sweet potato, peanut butter, raisins and chicken stock. Stir and cook for an additional hour or until potatoes are cooked though but not mushy.
At the end, stir in cilantro or garnish on top.