There are two outdoor sausage/beer gardens and they are practically right across the street from each other- Munchen Haus and Leavenworth Sausage Garten. Both offer a selection of more than a dozen kinds of mustards and about a dozen kind of grilled sausages. LSG offers Bratwurst, Bockwurst, Currywurst, Kielbasa, and more (some other international options include Chorizo and Italian Sausage as well as the standby beef Frank). Even if you are vegetarian, they have veggie sausage options, as well as pretzels and cheese and a few other sides. After ordering a staff member at LSG delivers based on a number you take after ordering, so you can relax among the heat lamps if its chilly.
Execution wise, the bite and warmth of how they grilled the sausages gives Munchen Haus the advantage over Leavenworth Sausage Garten. But mustard options wise I have to hand it to Leavenworth Sausage Garten. If you would like to take some of the sausages home, just walk down to Cured by Visconti Italian Market just a couple doors down to get some packaged up in their cases, as well as see their salami and other offerings.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.