I grew up in Santa Barbara, which is just about an hour from Santa Maria, the birthplace of the famous tri tip.
I've eaten this steak forever, and it is, by far, the best bbq steak you can buy. The only steak I like more is a tasty filet mignon (the big one, not the itty bitty cut).
Anyway, My hubby cooks a mean tip, but always on the bbq. My mom always roasts hers in the broiler. She says she broils about 7-8 minutes per side. All she does for prep is a little oil, pepper, & onion salt.
Anyway..........go on google, but type in "Recipe Santa Maria Tri Tip"
you'll get a lot!