All Oat Bitter/Keptinis
160 calories
14.3 g
Hops
Amount
|
Variety
|
Cost
|
Type
|
AA
|
Use
|
Time
|
IBU
|
Bill %
|
0.15 oz |
Centennial0.15 oz Centennial Hops |
|
Pellet |
10 |
Boil at 180 °F
|
60 min |
12.84 |
7% |
0.50 oz |
Fuggles0.5 oz Fuggles Hops |
|
Pellet |
4.5 |
Boil
|
15 min |
9.56 |
23.3% |
0.50 oz |
BSG - East Kent Goldings0.5 oz East Kent Goldings Hops |
|
Pellet |
5.3 |
Boil
|
15 min |
11.26 |
23.3% |
0.50 oz |
Fuggles0.5 oz Fuggles Hops |
|
Pellet |
4.5 |
Boil
|
5 min |
3.84 |
23.3% |
0.50 oz |
BSG - East Kent Goldings0.5 oz East Kent Goldings Hops |
|
Pellet |
5.3 |
Boil
|
5 min |
4.52 |
23.3% |
2.15 oz
/ $ 0.00
|
Mash Guidelines
Amount
|
Description
|
Type
|
Start Temp
|
Target Temp
|
Time
|
2 gal |
|
Strike |
166 °F |
152 °F |
60 min |
3.75 gal |
|
Sparge |
170 °F |
-- |
-- |
Starting Mash Thickness:
1 qt/lb
Starting Grain Temp:
80 °F |
Target Water Profile
Balanced Profile
Notes
Plan is to bake portions of the mash (like the keptinis descriped here: http://www.garshol.priv.no/blog/394.html) to achieve a darker wort and more complex flavor.
-----------------------------------------------------
Some results and lessons learned:
- While the mash converted, eventually, as evidenced by an iodine test, I have the feeling it was mostly larger unfermentable dextrines. While the wort was sweet, it definitely wasn't as sweet as I would have expected. When I baked the mash I got plenty of browning, some burning, but little actual caramelization - my Chemistry-fu is weak (something I should correct one of these days), but that seems like it would be indicative of more maillard reactions than caramelization. Finally, the Voss I pitched (@102f, held at 95f for the duration) chewed through the wort to 1.020 in just a few hours (lag time was maybe 45m), and then stuck there solidly. Next time, mashing with some glucoamylase alongside the alpha amylase might be in order. If only I could find some enzymatic oat malt...
- In retrospect, a step mash would probably be appropriate here; the oat malt is almost certainly under modified, and dealing with some of the beta-glucans would be a good idea. Next time, maybe rests at 113 and 122 would be a good idea?
- When baking the mash, I preheated the oven to 500f (with several baking stones on the bottom for thermal mass), before turning it down to 380f with convection right as I put the mash in. The mash itself was split between two aluminum roasting pans, a pyrex baking bowl, and a cookie tray, and baked for about two hours. While the mash in the roasting pans thickened and browned nicely, albeit with less caramelization than I had hoped for, the cookie tray just burned and the baking bowl remained fairly liquid inside. Roasting pans all the way next time.
- Next time I need to remember to allow the yeast more time to clean up; by the time I check the next morning, after brew day, this had already reached it's terminal gravity of 1.020, so I allowed it 24 hours to make sure it wasn't going to move, and then cold crashed. That was almost certainly too fast, even for kviek.
- Results: the pre-carb sample I pulled, after closed transfer to a serving keg, wasn't bad. The beer evidenced some harsh burnt toast flavors, but it seemed like it would be drinkable, especially after a little bit of mellowing with age. After a few days force carbing though, it developed a highly medicinal, hard to describe, backtaste - perhaps the carbonation just made some compounds (phenols?) more accessible to taste, or maybe I got an infection during the transfer or in the new keg? I'm going to let this keg hang around at room temperature for a few weeks before tossing it, on the off chance those flavors clear up, but I don't have high hopes.
View Count: 293
Brew Count: 1
Last Updated: 2020-08-24 18:28 UTC