Roast Beef Sandwiches with Horseradish Sauce

When I make roast beef I like to make a large one so that I have plenty of leftovers to enjoy in sandwiches like these roast beef sandwiches with horseradish sauce! The roast beef sandwich is so simple with plenty of moist and tender roast beef in a bun and it is oh so good, especially when slathered with a tasty homemade creamy horseradish sauce. I like to throw some pungent onions and juicy pickles into the sandwich to finish it off and the combination with the roast beef is just magical! There are so many different ways to enjoy roast beef in a sandwich and this roast beef sandwiches with horseradish sauce is my current favourite! What is your favourite roast beef sandwich?