Tender, flavorful pork, complemented by the heat and grilled ingredients of the salsa, creates an outstanding combination. When preparing the tenderloin, remove the silver skin, which is the thin, shiny membrane that runs along the surface of the meat. Leaving the silver skin on can cause the tenderloin to toughen and lose shape during grilling. Stretching the membrane with one hand so it’s tight, use your other hand to slip the tip of the knife underneath the silvery skin. Slowly slice back and forth, angling the sharp edge of the blade up, rather than down, through the meat. Continue this process until all the silver skin is removed, then discard.