I recently made a coconut porter too. I bottled it about....HEY! Three weeks ago today. After I get home from work I will taste a bottle. Anyway, I have only tasted one partial bottle after about 1 week. The coconut flavor was pretty much non existent at that point and it was over-carbonated.
I'll post the recipe below, but be easy because it was one of my first brews. I went pretty overboard on the caramel and chocolate malts. But, I love a sweet beer so it might be great for me. It also has the potential to counteract any sourness that the coconut might impart, as indicated by one of the posters above.
I'll update this tonight when I get home to let you know how it was.
BeerSmith Recipe Printout -
http://www.beersmith.com
Recipe: Basement Cat Porter
Brewer: David
Asst Brewer:
Style: Robust Porter
TYPE: Extract
Taste: (NA)
Recipe Specifications
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Batch Size: 5.00 gal
Boil Size: 7.30 gal
Estimated OG: 1.055 SG
Estimated Color: 34.1 SRM
Estimated IBU: 25.1 IBU
Brewhouse Efficiency: - %
Boil Time: 60 Minutes
Ingredients:
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Amount Item Type % or IBU
6 lbs DME Dark Traditional (Briess) (8.0 SRM) Dry Extract 74.99 %
1 lbs Caramel/Crystal Malt - 80L (80.0 SRM) Grain 12.51 %
1 lbs Chocolate Malt (350.0 SRM) Grain 12.50 %
1.00 oz Williamette [3.40 %] (60 min) Hops 12.6 IBU
0.75 oz Goldings, East Kent [4.50 %] (60 min) Hops 12.5 IBU
0.25 oz Goldings, East Kent [4.50 %] (0 min) (AroHops -
1.00 tsp Yeast Nutrient (Boil 0.0 days) Misc
1 Pkgs Nottingham Yeast (Lallemand #-) Yeast-Ale
Mash Schedule: None
Total Grain Weight: 10.00 lb
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Steep grains as desired (30-60 minutes)
Notes:
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Added 6 g of baking soda to steeping water. Steeped in 2 gallons of water
Added 14 oz of lightly toasted, sweetened, shredded coconut to fermenter. Left for 8 days.
Primed with 3.75 oz of light brown sugar
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Some things to note about adding coconut to beer:
1. It looks disgustingly like some kind of infection when it starts to ferment. Something like a white layer with crusty bubbles and chunks.
2. There will be a disturbing thick layer of oil on the top of your beer after the sugars have been leached from the coconut. I don't have the capabilities to cold crash, but since coconut oil is a saturated fat and solid at slightly cooler than room temperatures, putting it in the fridge for a few days SHOULD allow you to rack from underneath the layer of oil.
3. All that coconut in the fermenter WILL clog up your siphon. I had to suck on the end of the hose and stick it back in the bottling bucket to get it going again, and even that BARELY worked. In the future I would wrap the racking cane in some sort of mesh bag to counteract all the coconut sediment. I ended up losing about 1 gallon to all of the coconut shreds.
3.A. I would recommend priming with less sugar than you think that you will need. The reason for this is that I calculated my priming sugar for 5 gallons at 2.0 volumes. I ended up with about 3.8 gallons; as a result I have a porter that is carbonated at 2.6 volumes or so. It might be worth it to undershoot, since you will lose some beer to the coconut. This is especially true if you pour in your priming sugar first and then siphon your beer into the bucket.