Free: Contests & Raffles.
If it's "thoroughly cooked," it's ruined in my opinion. I usually pan fry for just a couple minutes per side. But I like it extremely rare.
Past couple I have cut the strap into thirds then vac seal them. I have been taking one out and butterflying them and pounding them flat, proceed to stuff them with grilled onions, garlic, jalapeños and cream cheese/cheddar mixed and roll that up and wrap it with bacon. Tried it on the grill, smoker and camping on a cast iron and it is my go to way to cook backstrap now.