Sorry for the delay - I've been on vacation!
Hmmm, DougMose... I'm not too sure about this one.
One more disclaimer before I begin: I am only familiar with Swedish preparations. I know, for instance that both Island and Norway are crazy about lamb/sheep and suspect that the preparation you're thinking of may be non-Swedish.
What is eaten in Sweden is known as "fårfiol" or, literally "sheep violin". As far-fetched as the name is, the end result isn't too far off from looking like a violin (if you keep the shank/hoof on).
You'll need an entire leg of lamb. The cure consists of about 2 and a half quarts of water, 1 cup of water and 3.5 tablespoons of sugar. Or, if that's too little, just keep the ratios and increase the amounts. I'm sure you can add saltpeter to this cure but none of the consumer-oriented recipes I've found in Sweden call for it. Cure the leg for 3 days. After the cure, pat is dry and either cold smoke it or dry/bake in a cool (200 degrees F) for 7-8 hours.
Fårfiol is normally sliced thinly and eaten plain or used on sandwiches (for instance, on soft flat-bread with horseradish-spiked fresh cheese) or, if smoked, even mixed into scrambled eggs (ala smoked salmon, I suppose). It's honestly not nearly in the same league as any long-cured products I know of but perhaps interesting in its own right.
Good luck in your searches, DougMose and let us know if you end up finding the recipe you're looking for!