Step 1 - Stick the hotdogs on some kind of skewer. Then slice around the hot dog in a spiral. Since it's on the skewer, you can slice all the way through to the skewer. (Sorry this picture is blurry. I got the bright idea to share our spiral delights in the middle of his slicing.)
Here is finished spiraled hotdogs. Ready for grilling!
Step 2 - Grill those suckers! It takes just a minute or two because they are spiraled and cook fast. Be careful with turning them and picking them up because they are delicate.
Step 3 - Voila! Finished hotdog -- prepare as desired.
My kids love these things, except the baby - she's a little freaked out by them. I'm not sure why, lol. I don't know why, but these taste so much better than regular ol' hotdogs. I think it's the grilling of the entire thing inside and out, maybe.
Enjoy!