I've made this with my own roast beef,
also had good results with deli meat.
Simply slice 1/4" thick and your good.
Place on a tray with prepared horseradish
sauce to serve right at room temperature.
1 pound deli sliced roast beef
1/4 cup prepared horseradish
Purchase deli sliced roast beef and
tell them to slice the beef about 1/4" thick.
Cut int serving size pieces and serve with
as much hot horseradish sauce as you wish.
A supply of toothpicks is a good thing.