Bake ribs in a 290ºC oven until the fat is dark brown and crispy on top, about 35 minutes. Remove from oven and cool slightly. Refrigerate until well chilled, about 3 hours. (This is done so the juices will solidify and the steaks can be cooked rare.) Remove fat cap and disgard. With the blade of a large knife, scrape off the onions and as much of the seasonings as possible and discard. Then with a long knife, slice between ribs into 6 steaks (4 will have bones); trim the cooked surface of meat from the 2 pieces that were on the outside of the roast. Season and cook in your favorite way for steaks. TO BLACKEN THE STEAKS: Combine the ingredients of the seasoning mix thoroughly in a small bowl; you will have about 8 Tb. Sprinkle the steaks generously and evenly on both sides with the mix. using about 4 ts on each steak and pressing it in with your hands. Heat a cast iron skillet over very high heat until it is beyond the smoking stage and you see white ash on the skillet bottom--at least 10 minutes. (The skillet cannot be too hot for this method.) Place one steak in the hot skillet (cook only one side at a time) and cook over a very high heat until the underside starts to develop a heavy, black crust, about 2 to 3 minutes. Turn the steak over and cook until the underside is crusted like the first, about 2 to 3 minutes more. Repeat with the remaining steaks. Serve each steak while piping hot. (NOTE: If you don't have a commercial hood vent over your stove, this dish may smoke you out of the kitchen. It's worth it! But you can also cook it outdoors on a gas grill; a charcoal fire doesn't get hot enough to "blacken" the steak properly. (FHT-if you have a smoke detector in your house, you will be able to determine if it is working correctly.) This is NOT a dish to prepare in an apartment building with a central fire alarm system wired into your smoke detector. It causes great excitement! Also, you can be guaranteed you will meet your landlord.) Servings: 6