Saute onion and garlic in a little olive oil until tender.
In your slow cooker combine garlic, onion, with the rest of the ingredients except for the peanut butter and optional garnishes.
Cook on Low 8 hrs.
after 8 hrs, in a small bowl combine some of the liquid from the crockpot with the peanut butter and whisk until it is all combined. Pour the broth/peanut butter mixture back into the slow cooker and mix.
Serve stew with chopped dry roasted peanuts sprinkled on top and lime wedges on the side to squeeze over.