Check out Brian's Slow Roasted Beef for Sandwiches - Oven Method.
When choosing a Eye of Round or Round Roast, select a roast that is uniform in width. (Center cut) Both Costco and Sam's Club have nice roasts in stock.
For the blog post related to this recipe, along with a step by step with pictures, go to Slow Roasted Beef - Eye of Round
Tri-Tip Seasoning A nice blend of salt, pepper, garlic and parsley.