What to do with a big tip sirloin roast?

season it and roast it med rare in a hot oven
paper thin slices across the grain on a bun with horseradish a big slice of tomato

Make Hot Italian Beef sandwiches

1. Rib exterior with garlic powder, salt, black pepper, oregano, bit of crushed red pepper
2. Put in rack in a roasting pan and use water and beef stock in the bottom
3. Roast at 350 to about 130 or so.
4. Refrigerate overnight, along with the sauce jus
5. Slice the next day as thin as possible
6. Skin fat of off au jus and reheat until hot; then add slices of beef until warmed through
7. Make sandwich with gardineria, hot peppers , etc

I make these every football season for a tailgate. Always turn out well