Perhaps if it's a secret...one wouldn't divulge that information here.

However...I'm planning to brew up a Dopplebock this weekend using the yeast slurry from my Schwarty.
Here's my recipe:
Dominator Dopplebock
All Grain Recipe
Brewer: bluesman
Batch Size: 11.00 gal
Style: Doppelbock ( 5C)
Boil Size: 13.23 gal
Style Guide: BJCP 2008
Color: 20.1 SRM
Bitterness: 23.2 IBUs
Boil Time: 90 min
Est OG: 1.078 (18.4° P)
Mash Profile: Single Infusion,Fly Sparge
ABV: 7.7%
Ingredients:
15 lbs Dark Munich Malt - 10L (9.9 SRM)
15 lbs Vienna Malt (3.5 SRM)
1 lbs Aromatic Malt (26.0 SRM)
1 lbs Melanoiden Malt (20.0 SRM)
8.0 oz Carafa I (319.0 SRM)
6.4 oz Caramunich Malt 2 (60.0 SRM)
6.4 oz Caramunich Malt 3 (150.0 SRM)
1.5 oz Hallertauer [3.9%] - Boil 60 min
0.5 oz Magnum [14.0%] - Boil 60 min
1.0 oz Hallertauer [4.8%] - Boil 20 min
1.00 tsp Irish Moss (Boil 10 min)
German Lager Yeast (White Labs #WLP830)
1.00 tsp Yeast Nutrient
This is what I made the last year. I think I want to remove some of the crystal malt and add a touch more Carafa for a darker beer.
What's your trick for this style?