As a kid, growing up in Chicago, we always ate lean corned beef in a sandwich with mustard on rye and a kosher dill pickle.
Sandwich from Manny’s.
When I moved to Wisconsin, I switched to cross cut corned beef on rye with mustard and a kosher dill pickle.
Sandwich from Jake’s.
My drink of choice with either is a Dr. Brown’s, Green River, or chocolate phosphate. Both are great sandwiches. My favorite is Jake’s.