xD Sure thing, mate. 1 grated yellow onion, 350 ml ketchup, 75 ml molasses, 50 ml Worcestershire sauce, 75 ml apple cider vinegar, 30 ml English mustard (more if you want more spice), 4 tbsp of homemade rub.
EDIT: the rub has loads of cayenne and ground chile de árbol, other than the usual...