A roast beef sandwich recipe featuring ready-made, deli roast beef, marbled rye, roasted red bell peppers, spinach, shallots and an easy horseradish roast beef sandwich spread to top it all off!
Add all of the creamy horseradish sauce ingredients to a small mixing bowl, and whisk to combine. Set aside until ready to use.
For the sandwiches, lay out the slices of bread onto a work surface. Smear desired amount of sauce across the bottom slice of bread and top with 3 slices of roast beef, folding each a bit like an accordion to fit it on on the slice of bread. Add shallots, roasted red pepper, and spinach to your liking, dividing the ingredients evenly amongst the sandwiches.
Top with a generous dollop of creamy horseradish sauce, as well as a tiny pinch of Kosher salt and pepper. Top the sandwich with the other slice of bread, serve right away and enjoy.