If you want good corned beef sandwiches, take your corned brisket, coat with some melted bacon grease and melted butter then cover with coarse ground black pepper and some kosher salt. Wrap the whole thing in foil twice. Put this on a rack on one of those old fashioned blue enamel roasters with an inch or so of water in the bottom of the roaster. Cook in the oven on about 250 degrees for 4 or 5 hours. Slice against the grain for some excellent sandwich material.