Barbecued Frankfurts

This is a recipe from my Great Grandmother Neuhard for Barbecued Frankfurts.

18 hot dogs,cut lengthwise
3 tbsp butter
1 c. chopped onion
4 tbsp brown sugar
1 tbsp ground mustard (the dry spice)
1 tsp celery salt
1 tsp paprika
1/2 tsp pepper
1/2 c. ketchup
2 1/2 tsp vinegar
3/4 c. water
Brown the onions in butter for 5 minutes. Mix the sugar, mustard, celery salt, paprika, pepper, ketchup, vinegar & water and bring to a boil. Add the onions. Lay the lengthwise cut hotdogs in a baking dish. Pour the liquid over and bake for 25 minutes at 350 degrees.