Looks like in order to combat demons from hell, the Doom developers thought to airdrop messenger bags probably filled with Swiss ready-made bricks of fondue onto the battlefield:
I find this rather unfortunate, since every Swiss person knows that freshly made fondue with your own selection of cheeses, with or without Kirsch and matched to the right sort of white wine is the best. Ready-made supermarket stuff can never quite compete. It’s almost as bad as ready-made rösti!
What a disappointment, Bethesda.