Picanha is a famous Brazilian cut of beef from Brazil, also known as top sirloin or rump Cap that has its thick fat cap on it.
One popular Brazilian technique for this cut is to serve it in stripes, basically making your steaks cutting those to have the entire length of the roast. And the magic on that is that you get in every steak the shorter/thinner part of the cut (that is most tender) and the larger and juicer thicker part.
When you cut the steaks differently than that, people that eat the thicker parts, or the first steaks, won’t be as tender or flavorful as the smaller steaks coming from the tip of the roast.
Test it out and check the difference, Brazilian pit masters will be glad you’ve learned how to get this cut to perfection.
Also, go simple on the seasoning, so you don’t overpower the flavor of the meat, trust me, it will be incredible.