I did up the Cattlemans's Ranch flat cut Corned Beef from Aldi tonight. It has been in the freezer for a few weeks and does contain papain. I did it in the IP, covered with water, about a 1/2 cup of cider vinegar, a half cup of Crystal hot sauce, 5 bay leaves, 5 cloves of garlic, peeled, for 90 minutes at high pressure. Natural release (took about 25 minutes) and wrapped it in foil and put it into a warm oven. Then I put the potatoes, cabbage and carrots in the IP with the pot liquor at high pressure for 5 minutes and pressure release at 10 minutes. Nice and tender and sliced well hot, which means it will slice even better for sandwiches, when chilled. We loved it.
HC