I like picanha a lot. The one I had a month or two ago was absolutely outstanding. The queen of steaks! It was a memorable meal - especially with the chimichurri sauce with fresh parsley which is a must with picanha. So a few days ago I picked up one over at Lotte (Asian) Market. I wanted a small one for just the wife and I, and so bought the smallest one available out of five. Took it home. Cooked it last night on the Weber the usual way. Very disappointed! Very tough. I know how to trim picanha and I know how to cook picanha and I know how to slice picanha, so what is going on??? I checked the cryovac wrapper and it was the same packer I had purchased from previously - HIGH RIVER ANGUS. So why? This discouraged me. I don't want to be buying picanhas and have them turn out hit and miss. I want a wonderful picanha every time!
After sleeping on it, this morning I realized what happened. The one I picked out was amazingly hard in the wrapper. It was really stiff. At the time, I thought it just had a really thick fat cap. But now I realize it wasn't the fat cap, it was the cow. It was just a tough piece of meat. In other words, one needs to choose a picanha just like he'd choose a brisket. Look for marbling. Look for flexibility. Make sure it's floppy, and don't base the purchase just on size or grade.
Rookie mistake!
Lesson learned.