I think the key is to carb it up quickly and start drinking it. As far as I understand it is basically a young Helles so it sounds like you just need a good Helles recipe? I believe there is a recent thread discussing Helles.
"Most Pale Kellerbiers are young, unfiltered, unpasteurized versions of Munich Helles beer, although Pils or
a different, custom golden lager beer designed specifically for serving young could also be used. The best examples are served only on tap at many of the Munich area breweries. Bottled versions are not likely to have the freshness, hop character and young beer notes exhibited by the draft versions. Also some times called Zwickelbier, after the name of the tap used to sample from a lagering tank"