I was never able to tell the difference between grass fed and regular ground beef.
But if you want alittle different taste, coat the pan with a generous dollop of coconut oil. Smush in a truckload of salt and Italian seasoning. After you take it out of the oven, let is sit for 10 minutes and the fat which came out will soak back in. I really like the taste, but that's no guarantee you will.
For what it's worth, I tried filet mignon once to see if I liked the taste of raw meat. I didn't... it tasted, I dunno, too cold or veggie-like.
5'0" female, 43 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Current weight: skinny-fat 106 lbs. Resetting with the 21-day challenge.
MY PRIMAL: I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I aim for 80-90 g carb/day and advocate a two-month strict adjustment for newbies. But everybody is different and other need to tweak Primal to their own needs.