Place in preheated oven and bake for 15 minutes. Reduce heat to 325 degrees, without removing roast or opening oven. Continue to bake until 135-140 degrees.
Remove roast and let rest. The roast will continue to cook while resting.
PoBoy Garlic Aioli
While the roast is cooking, place 4 cloves of garlic in a small dish and place in oven. Remove when the garlic is lightly brown, about 15 - 20 minutes. Let cool.
Combine garlic, mayonnaise, Worcestershire sauce, salt, and pepper in blender and blend to combine.
Gravy
In a skillet, melt the butter. When melted, add the flour and whisk. Cook until caramel brown over medium heat. The cook time will vary, about 20 minutes.
Add drippings from roast pan to flour mixture and combine. Add beef broth, stirring constantly.
Cook until the gravy reduces, approximately another 20 minutes.
Salt and pepper to taste.
PoBoys
Toast Hoagie buns with butter.
Slice lettuce and tomato.
Cover each side of hoagie buns with aioli. Layer with lettuce, tomato, and beef. Drizzle with gravy. Serve.
Notes
Cooking times will vary. If you haven't made gravy before and have questions, please reach out. You will want to stir the gravy constantly. Don't walk away while it is on the burner as it is very easy to burn.