What a cute idea for a theme! I'm not feeling super inspired right now, but what about devil's food cupcakes and grilling some meat with a spicy rub? You can buy rubs at the grocery store or very, very easily make your own.
I'm thinking you could tie a lot of things in with the theme by making a spicy version, playing off the "hell is hot" thing and giving them cute names that go with your theme.
I thought this recipe for Devil's Food Cupcakes looked and sounded pretty darned sinful:
Thanks for all the suggestions! I am having a red & black theme. I suggested guest attire stick to the that in the invitation. I'm also trying to put together a cool music playlist. It's all kind of last minute. I have a fire pit and red lights for trees, am I missing something obvious?
I had thought devils food cake, but I like red velvet too. And spicy, why didn't I think spicy?! Perfect! Keep the help coming...