Begin by rolling out the crescent rolls. Lay them flat on a pan, layer the fat end with loads of roast beef.
Add spinach or mustard or whatever additional stuff you’d like. The possibilities are pretty endless. (A small slice of bacon works great!)
Lay the string cheese on the widest end of the crescent roll and roll forward like you would roll a regular crescent roll, holding it all together so it doesn’t fall out.
Place the crescent roll up on baking sheet and bake as directed on the package of crescent rolls.
(I think it’s about 375 degrees for about 11-13 minutes)
Remove from oven and allow to cool for about 3-5 minutes. Serve piping hot and with some dipping sauces or au jus!