Saute onion in butter until soft in small saucepan. Add all other ingredients (except the hotdogs). Bring to a boil, and simmer for 10 minutes. Cut the hotdogs on a diagonal, but not all the way through. Place hotdogs in a pan and cover with sauce. Bake until they are cooked through. This is very easy to make in the microwave. It is especially good with mashed potatoes.