Mister Brisket (a.k.a. Sanford Herskovitz) has expanded his specialty butcher shop to include a carryout sandwich counter, featuring everything from barbecued beef to rich Romanian pastrami. But the real draw is the unconventional corned beef, baked in a convection oven, rather than boiled, as is done in most delis. Does it make a difference? Try it, then decide for yourself.