I specifically call for Canada goose breasts here because they're the only ones I think are large enough to make this with, although domestic goose breasts will also of course work, if you have them lying around. Ditto for swan or sandhill crane breasts. Could you do it with snow goose or speck breasts? Yeah, but they'll be a lot smaller, and I'd only cure them for 24 hours instead of 24 to 36.
Weigh your goose breasts. For every pound of goose, you'll need 10 grams of kosher salt, which is about a tablespoon. It's OK if you are a little off on this measurement. Mix the salt, curing salt, sugar as well as the thyme, celery seed, caraway, juniper and the teaspoon of black pepper and grind them all together in a spice grinder. Pack the goose breasts with this mixture, massaging it into the meat. Put the goose into a closed container in the fridge for 24 to 72 hours.
When you are ready, rinse off the goose and pat it dry. It's fine if you have a little bit of the cure stuck to the meat, but you don't want too much. Put the goose breasts on a rack in the fridge and let them dry uncovered for a day.
Smoke the goose breasts until the interior hits 140°F, which takes me about 3 hours.
A word on the Instacure. The 3 grams I call for will actually be enough to cure up to about 3 pounds of goose meat. A general rule is about 1 1/4 grams of Instacure per pound. Do not use more than I call for, though. You can buy curing salt No. 1 online.
Be careful when you are smoking your goose, as the internal temperature can skyrocket in such small pieces of meat. They'll be ready in 90 minutes in a hot smoker, which to my mind isn't enough time on the smoke. Try to keep your smoker at 200°F or cooler; I like to keep it at 160°F, which lets me smoke the goose for a solid 3 to 4 hours.
What wood? Your choice. I prefer oak, maple or hickory for this, followed by walnut, pecan or cherry.