The first time I tried it, came out nice and tender, but the 60 minute version expelled most of the fluid (aujois) from the jars. So I decided to try again and partially pre-cook the meat first, then stuff it in the jars with a bullion and top off with water, cook for 15-20 minutes after getting steady steam. The jars came out very nice.
NOTE: The first time I used this years venison, the second batch was with front quarter meat from my brothers deer 2 seasons back (almost 2& 1/2 years in my freezer) I was thinking of making burger with it . I CANNOT TELL THE DIFFERENCE between the fresh meat and the old tough meat as far as tenderness and flavor.
Ok, so I figured I would try it again...this time also pre-cooked, a tiny bit more salt, fresh ground black pepper and about 1/4 teaspoon of crushed red-peppers.....
Now I know what to do with older meat from the freezer. I might never do burger again. This stuff is excellent