Step 1

Coat roast with olive oil and season with Beef Rub. Use a sharp knife or large tined fork to pierce all over. Rub olive oil and seasonings down into the meat.

Step 2

Prepare grill to 300°. Add roast over indirect fire and cook 1 1 1/2 hours or until roast reaches about 155° internal temperature.

Step 3

Remove from grill and allow to rest 10 minutes before slicing.

Step 4

If you are not serving immediately, cool roast slightly and wrap in plastic wrap before slicing.

Step 5

To make the sandwiches: Add 2 tablespoons butter to a skillet and add sliced roast. Cook until just heated through. (Skip this step if you are making sandwiches just after grilling.)

Step 6

Butter each side of the buns with remaining butter and toast lightly.

Step 7

Top each bun with sliced roast beef, top with horseradish sauce, onions strings and top bun.

Step 8

Serve immediately.