What is the best method to make a simple, classic roastbeef? How big for two people (but leftovers are fine)? What cut? What temperature should it cook at? What type of pan (rack or right on the bottom)? Best way to season? Onions surrounding it? How do I slice it? I’m not an expert cook, but a roastbeef, or any kind of roast for that matter, seems nice and easy!