Stir all ingredients into oxtails

Let it marinate overnight.

Separate oxtails from ingredients

Add canola oil to frying pan

Cook oxtails on each side for 10 mins

Transfer oxtails, oil, and the rest of the ingredients to slow cooker

Put slow cooker on high

Add just enough water to cover meat or halfway

Cut up potatoes and carrots

Put top on slow cooker-let it cook for 6 hours

Add potatoes and carrots-cook for 1 hour

Add butter beans (optional)

Stir and serve