Ah... so you had the yellow festbier version. It is of course very tasty. Essentially a festbier is just a stronger, higher ABV helles. The simplest recipe is mostly Pilsner malt, with maybe a handful of Munich (optional), to give you an OG of about 1.057, with some noble hops for bittering only to give 20-25 IBUs, no late hop additions. Select your favorite lager yeast (I like 2206, WLP833, or Diamond). That's it in a nutshell. Simple but delicious.