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I believe that with the new salt and pepper shakers, the salt shaker is the one with 3 holes, while the pepper goes in the one with 2 holes. Salt is used more than pepper anyway. Pepper should only ever be fresh ground at the table, meaning salt shakers win out.
Moving beyond grilling, Bitterman suggests uses for salt bocks you never dreamed of, from cocktails to candy, from ceviche to pizza, even ice cream mixed and served on a frozen salt slab. And yes, you can reuse the salt blocks.