You can use deli roast beef for this recipe or you can use leftover roast beef.
This is my favourite recipe** for an incredibly delicious, flavorful roast beef. Use a sharp knife to cut thin slices of beef for sandwiches.
Toast your sandwich. Once assembled, place the open halves on a cookie sheet and broil for just a few minutes, until the cheese is melted and the bread is lightly golden.
When making your own roast beef, use an instant read thermometer to confirm that the internal temperature of the meat is high enough to ensure food safety.
Store your leftovers in an airtight container, in the fridge, for up to ** days.