Cut the stewing beef into bite sized chunks and place into a pot. Chop ¾ of the first onion and add it to the beef. Reserve the other ¼ onion for the sauce.
Chop the tomatoes into small chunks and place them into a blender or food processor. Add the ginger to the tomatoes.
Add the desired amount of scotch bonnet peppers.
Break the smoked mackerel into chunks and add to the stew (optional). Add a little more water and allow to simmer for 5 minutes to allow the flavors to infuse into the sauce.