Pork sirloin tri tip. What is it and how do I cook it?

If it's only 1 1b I would go, I think, with the outdoor grill method---again, indirect heat. But now I'm thinking maybe a Korean style Bo Ssam which would be pork that is first braised and then finished on the grill. You would need access to Korean ingredients though.

Frankly I've never of pork being butchered that way---and I live in tri tip country. The beef equivalent usually weighs about 3 to 4 pounds. It's narrow at one end and wide at the other. With pork I would think about oven roasting it or else grilling it slowly over wood coals using the indirect method. For the latter just rub it down with salt, pepper and rosemary. It also might make a nice porchetta.