First, set the stage by washing all your veggies. Slice your tomatoes, onions, and pickles. We want everything ready to go. If you haven’t done so already, grab a knife and slice your submarine rolls in half, making sure not to cut all the way through. You want them to be like a little pocket for all those delicious ingredients.

Now comes the fun part! Let’s add some flavor. Take your creamy mayonnaise and spread it generously on one side of each roll. Then, on the other side, slather on the Dijon mustard. Don’t hold back, folks! You want those flavors to meld beautifully.

Time to build your sandwich! Start with a bed of fresh lettuce on the mayo side. This not only adds a nice crunch but also helps to keep the bread from getting soggy. Next, layer on your sliced roast beef. Pile it high because, let’s face it, it’s the star of the show.

Now, place two slices of aged Swiss cheese atop the roast beef. Just imagine how melty and delicious it will be! Follow up with your sliced tomatoes and onions. Add a few dill pickles for that tangy burst of flavor. Don't forget a sprinkle of salt and pepper!

If you’re feeling adventurous, spread a little bit of horseradish sauce on top of the veggies for an added kick. This step is optional, but it definitely elevates the flavor profile.

Once you’ve finished layering, gently close your submarine rolls. If desired, you can press them down slightly or even wrap them in parchment paper to hold everything together. And just like that, your Jersey Mike’s inspired roast beef sandwich is ready to indulge in!