We love it whenever an inexpensive cut of meat is coaxed into a glorious showstopper, and this pork masterpiece is perhaps the best example we can think of. Even the sight of it is delightful, as it glazes over with a sheen in shades of rose and amber. The garlicky adobo—that's the marinade, not the commercial powder—is pushed into slits in the meat to penetrate to the deepest layers; the outer layer, rubbed on the roast, forms a sticky crust of irresistible caramelization; and the skin becomes a rich, crunchy chicharrón, the last pieces of which everyone will surely fight over.
04Put pork, skin side up, in a flameproof roasting pan, discarding marinade, and bring to room temperature, about 1 hour.
05Meanwhile, preheat oven to 350°F with rack in middle.
06Cover pork with parchment paper and then tightly with foil and roast 2 1/2 hours. Discard foil and parchment, then add 1/2 cup water to pan and roast, uncovered, adding more water when liquid in pan evaporates (check about every half hour), until skin is browned and crisp and meat is fork-tender, 2 to 2 1/2 hours more. Transfer to a cutting board or platter, reserving juices in pan, and let stand 30 minutes.
07Meanwhile, pour pan juices through a sieve into a fat separator or bowl and discard fat. Add 3/4 cup water to roasting pan and deglaze by boiling over medium-high heat (straddle 2 burners if necessary), scraping up brown bits, 1 minute, then add to pan juices along with enough water to bring total to 1 1/2 cups.
08Cut skin off roast pork. (If skin is not crisp, roast in a shallow baking pan in a 475°F oven until crisp, about 10 minutes.) Cut skin into serving pieces. Pull meat from roast in pieces using a fork. Serve meat with pan juices and pork skin.