Step 1: Sauce ... This sauce can be made with sour cream, mayonnaise, or a mix of both, which is what I prefer. Use whatever you like best. You need 3/4 cup total of the sour cream/mayonnaise mix. Then, add all the ingredients, including the mustard if you want a little "tang," and mix well. Refrigerate until ready to use.
Step 2: Au Jus ... Add the butter to a small saute pan (not a pot), and bring to medium heat; then add the garlic and shallot and cook 1-2 minutes stirring often. Add the flour and cook another minute to get "rid" of the raw flour taste. Then, slowly add in the wine, broth and 1/2 teaspoon of the worcestershire, continuing to whisk until everything is well combined. Bring to a light broil (to thicken the sauce), then reduce to low to keep warm. If you like the au jus a bit richer, you can add a bit more worcestershire sauce.
Step 3: Rolls ... I like to toast my rolls, but it is not necessary. Just slice in half and toast under the broiler, until lightly golden brown.
Step 4: Roast Beef ... I like my roast beef medium rare; so, I just dip my roast beef in the au jus before adding it to the sandwich. However, if you prefer yours well done, you can add the roast beef to the au jus and let it warm up and cook it a bit more (just 1-2 minutes). That is just a personal preference.
Step 5: Sandwich ... Toast the rolls if you want, slather with some of the horseradish sauce; then, whether your roast beef has been simmering in the au jus, or you are just dipping it - pile the roast beef on the roll.
Step 6: Serve ... As I mentioned, you can add provolone cheese or caramelized onions if you want; but for me, it is simply the roast, beef, horseradish sauce, and most importantly, a bowl of au jus for each person to dip their sandwich in. ENJOY!
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