Next you’ll want to start assembling your sandwich. Add on the roast beef and the havarti cheese. I know that traditional french dip uses swiss cheese. You’re more than welcome to use swiss, but I LOVE havarti. It’s creamy and melts really well.
PRO TIP: Before we move on, let’s talk about what will make or break this sandwich. Since there are only a few ingredients to this sub, each ingredient matters. Using slimy roast beef from sub par delis could result in a sub par experience. Be sure to get some good quality, good textured beef. You don’t have to break the bank to do so either! Just keep in mind, a few more dollars goes a LONG way when dealing with roast beef. I get mine from Costco and it is delicious!