Place the ribs in a large stockpot. Pour in the cold and add enough water to just cover them. Bring to a boil over high heat, skimming off any foam that rises to the surface. As the liquid is coming to a boil, add the salt and peppercorns. Once at a boil, reduce the head to low, cover, and gently simmer until the meat is tender but not falling off the bone, which is about 2 hours. Line a rimmed baking sheet with paper towels. Use a slotted spoon to transfer the ribs to the baking sheet. Discard the cooking liquid; remove the paper towel form under the ribs and discard it.