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Traditional Bock (Extract)

Style Name: Dunkles Bock
Style Category: Amber Malty European Lager
Estimated Original Gravity: 1.066 SG
Estimated Final Gravity: 1.016 SG
Estimated Alcohol by Vol: 6.5 %
Estimated Calories: 0.0 kcal/12oz
Batch Size: 5.00 gal
Bitterness: 24.2 IBUs
Description: The origins of Bock beer are quite uncharted. Back in medieval days German monasteries would brew a strong beer for sustenance during their Lenten fasts. Some believe the name Bock came from the shortening of Einbeck thus "beck" to "bock." Others believe it is more of a pagan or old world influence that the beer was only to be brewed during the sign of the Capricorn goat, hence the goat being associated with Bock beers. Basically, this beer was a symbol of better times to come and moving away from winter. As for the beer itself in modern day, it is a bottom fermenting lager that generally takes extra months of lagering (cold storage) to smooth out such a strong brew. Bock beer in general is stronger than your typical lager, more of a robust malt character with a dark amber to brown hue. Hop bitterness can be assertive enough to balance though must not get in the way of the malt flavor, most are only lightly hopped.

Amt Name Type # %/IBU
1.00 lb Caramunich® III (76.2 SRM) Grain 1 9.7 %
0.25 lb Carafa® Special I (337.5 SRM) Grain 2 2.4 %
2.50 lb DME Pilsen Light (2.0 SRM) Dry Extract 3 24.2 %
6.60 lb LME Munich (8.0 SRM) Extract 4 63.8 %
1.00 oz Magnum [15.20 %] - Boil 60.0 min Hop 5 24.2 IBUs
1.00 Items Whirlfloc Tablet (Boil 15.0 mins) Fining 6 -
0.50 tsp Yeast Nutrient (Wyeast) (Boil 10.0 mins) Other 7 -
4.0 pkg Bavarian Lager (Wyeast Labs #2206) [124.21 ml] Yeast 8 -

Note: SafLager West European Lager S-23 may be used as a dry yeast alternative.

Brewing The Beer

1. Read

Read all of the recommended procedures before you begin.

This recipe assumes that you have a boil pot large enough to boil 2.93 gal of wort.

2. Sanitize

Thoroughly clean and sanitize ALL brewing equipment and utensils that will come in contact with any ingredients, wort or beer.

3. Steep grains

Add half of 2.93 gal of clean water into your brew pot and begin to heat. Pour crushed grains into grain bag and tie a knot at the top of the bag. When the water is within an appropriate steeping temperature (150º - 160ºF) turn off the heat and place the grain bag into the brew pot. Steep grains for approximately 30 minutes. Remove grain bag and gently squeeze out the liquid back into the brew pot. If you are afraid of extracting tannins by squeezing the grain bag, don't be.

Grains to Steep
Amt Name Type # %/IBU
1.00 lb Caramunich® III (76.2 SRM) Grain 1 9.7 %
0.25 lb Carafa® Special I (337.5 SRM) Grain 2 2.4 %

4. Add The Malt Extract

Add the malt extract. Once all the malt extract is in the pot add enough water to reach 2.93 gal . Make sure all of the malt extract is fully disolved before turning the heat back on.

5. Start The Boil

Bring your wort to a vigorous rolling boil. Right before the sweet wort begins to boil, break material will form a foam that can boil over quickly and unexpectedly. Spray some water on it to break up the foam or use a anti-foaming agent like Fermcap-S. Continue the vigorous rolling boil for 90 minutes.

6. Add Ingredients According To The Schedule

For any LME or DME additions that were not added earlier turn off the heat and make sure the extract is fully dissolved before turning the heat back on. If there are steeping hops add them after flameout.

Boil Ingredients
Amt Name Type # %/IBU
2.50 lb DME Pilsen Light (2.0 SRM) Dry Extract 3 24.2 %
6.60 lb LME Munich (8.0 SRM) Extract 4 63.8 %
1.00 oz Magnum [15.20 %] - Boil 60.0 min Hop 5 24.2 IBUs
1.00 Items Whirlfloc Tablet (Boil 15.0 mins) Fining 6 -
0.50 tsp Yeast Nutrient (Wyeast) (Boil 10.0 mins) Other 7 -

7. Cool Wort And Transfer

Cool the wort down to approximately 54.0 F by placing the brew pot in a sink filled with ice water or by using a wort chiller. Pour or siphon the wort into a sanitized fermentor.

8. Add Water

Add enough clean water to the fermentor to bring your wort to 5.00 gal . Thoroughly stir the water into the wort. Once you are satisfied your wort is at the proper volume and close to the estimated OG, record the OG on this sheet. It should be approximately 1.066 SG .

9. Aerate The Wort

During the boiling process most of the oxygen is removed from the wort. In order to provide our wort with healthy yeast we must add oxygen back into the wort. The yeast will use the oxygen to build healthy cell walls resulting in greater attenuation and an overall healthier fermentation. To aerate the wort you can shake your carboy back and forth or stir the wort vigorously. Some people use pure oxygen and a diffusion stone to add the maximum amount of oxygen.

10. Pitch Yeast

If you are using liquid yeast open the pack and pour the yeast into the wort. If you are using dry yeast, open the pack and sprinkle the yeast onto the top of the wort. There is no need to stir. Firmly secure the lid/stopper/bung onto the fermentor. Fill your airlock halfway with water and gently twist the airlock into the lid/stopper/bung. Move fermentor to a dark, cool, temperature stable area at 54.0 F .

Fermentation Ingredients
Amt Name Type # %/IBU
4.0 pkg Bavarian Lager (Wyeast Labs #2206) [124.21 ml] Yeast 8 -

Fermenting The Beer

11. Fermentation

The wort will begin to ferment within 24-72 hours and you will notice CO2 releasing (bubbling) out of the airlock. Airlock activity will be slower at 54.0 F then an ale fermentation. If you do not see any activity and you are fermenting in a bucket, spray sanitizer on the airlock and around the grommet. Gently twist the airlock out of the grommet and peek inside. If you see a foam also called "krausen" then fermentation is active. There may be a ring of dried krausen around the edge of the bucket right above the beer. This is normal and means that fermentation is working. Replace the airlock gently twisting it back into the grommet.

When the bubbling slows significantly or when the fermentation is 3/4 of the way done (measure with a hydrometer) move on to the next step.

12. Diacetyl Rest

Lager yeast tend to produce large amounts of diacetyl during fermentation. Diacetyl is a buttery flavored compound and must go. Fortunatly yeast will absorb it we just need to warm the beer slightly. Raise the temperature of the fermenting beer to 64.0 F and let it rest for 2.00 days.

13. Lager

Lower the temperature to 34.0 F and wait 48 hours. Then rack your beer into a cleaned and sanitized secondary fermentor, avoid transferring any sediment (trub), wait 30.00 more days and your beer will be ready for bottling*. Take a FG reading with a cleaned and sanitized hydrometer and record it on this sheet. It should be approximately 1.016 SG .

*If you are not going to use a secondary fermentor then simply let the beer sit in one fermentor for the entire duration.

Bottling The Beer

14. Sanitize

Thoroughly clean and sanitize ALL brewing equipment and utensils that will come in contact with any ingredients, wort or beer.

15. Prepare Priming Sugar

In a small saucepan dissolve 3.61 oz of priming sugar into enough boiling water to dissolve the sugar. Cool and pour this mixture into a cleaned and sanitized bottling bucket. Carefully siphon beer from the fermentor to the bottling bucket. Avoid transferring any sediment (trub). As the beer is being transfered over pour in your hydrated yeast mixture. After the beer is in the bottling bucket, cover it and let it sit and mix for 5 minutes. By siphoning your beer onto the priming sugar stirring is not necessary.

16. Bottle

Connect a hose and bottling wand to the spigot on your bottling bucket. Fill the bottles to the top of the bottle. When the bottling wand is removed the perfect amount of head space will be left in the bottle. Use a bottle capper to apply sanitized crown caps.

17. Bottle Condition

Move the bottles to a dark, cool, temperature-stable area (approx. 67.0 F). Over the next 21.00 days, the bottles will naturally carbonate. Carbonation times vary depending on the temperature and beer style, so be patient if it takes a week or so longer.

Drink, Share and Enjoy!

Tips and Suggestions

  1. The volume of wort boiled affects hop utilization. Boiling more than 2.93 gal gallons will increase the IBU’s and they will decrease if wort volume is less than 2.93 gal gallons. IBU’s for this recipe are calculated for a 2.93 gal gallon boil.
  2. Run canisters of LME under hot water to allow the extract to pour easier.
  3. Turn off your heat source when adding extract. Pay careful attention that the extract does not accumulate and caramelize on the bottom of your brew pot.
  4. To avoid bacteria growth chill your wort as quickly as possible. Do not add ice directly to the wort. Alternatively, you can use a brewing accessory like a wort chiller.
  5. Use a sanitized hydrometer while adding water to monitor the gravity.
  6. Consider transferring your beer to a secondary carboy.
  7. Use standard crown bottles, preferably amber color. Make sure bottles are thoroughly clean. Use a bottle brush if necessary to remove stubborn deposits. Bottles should be sanitized prior to filling.
  8. When consumed, hops can cause malignant hyperthermia in dogs, sometimes with fatal results.
Bull City Homebrew
1906 E. NC Hwy 54, Suite 200-B
Durham, NC 27713