Went to Zack's over the weekend and was highly impressed. They have a good variety of specialty dogs including the classic Chicago dog with the weirdo green relish. They sell jars of relish and sport peppers.
We had the Italian beef which was just okay. It was more roast beef in a thick gravy rather than an au jus as in Chicago. The Southern Style was top notch, with excellent homemade slaw and not too spicey chili. Pretty good curly fries too. I look forward to trying the Italian sausage.
The fixins bar has really good pickle chips and chopped cherry peppers (hoagie spread) as well as pepper rings.
Zack's is just off of Joppa Road on Old Harford Road.