In a bowl, combine all the currywurst sauce ingredients: ketchup, Worcestershire sauce, cayenne pepper, curry powder, diced fried onion, and honey. Season to taste with salt and pepper.
Cook the sausages according to the package instructions. Drain the sausages, and pan-fry them in a skillet until they become golden-brown. Cut into slices and serve with your homemade currywurst sauce.