I have absolutely no idea what Avalon steak seasoning is, so I subbed some Montreal steak seasoning instead. These were very good, although the instructions were a little vague, which knocked off a star. I didn't know whether to steam the whole thing in a steamer over water, or cook it in a bain marie. In the end I combined it all and baked it at 350 degrees F, placing the casserole dish in another dish and pouring boiling water to come halfway up the side of the dish. It worked like a charm!
Mighty tasty, following Mirj's instructions.