I brew a 1-gallon/15 minute boil, single-hop extract pale ale. It’s quick to do, and you can fit several batches in the time it takes for a typical all-grain brewday if you have a bunch of hops you want to try out. It’s been a few years since I’ve done a batch of these, but a forum search here for “single hopped” should find my old posts with my procedure and tasting notes for various varieties I’ve tried.
Here’s a sample recipe. I shoot for 1.055 OG and 40-45 IBU’s. That’s enough IBU’s to get a picture of how the hop works for bittering without being so much that it overshadows the flavor/aroma. The Munich extract is to boost the maltiness just a bit to get an idea of how the hops interact with malt.
Title: Single Hop Pale Ale
Brew Method: Extract
Style Name: American Pale Ale
Boil Time: 15 min
Batch Size: 0.8 gallons (fermentor volume)
Boil Size: 1 gallons
STATS:
Original Gravity: 1.055
Final Gravity: 1.015
ABV (standard): 5.21%
IBU (tinseth): 40.96
SRM (morey): 4.8
FERMENTABLES:
0.8 lb - Dry Malt Extract - Extra Light (72.7%)
0.3 lb - Liquid Malt Extract - Munich (27.3%)
HOPS:
0.15 oz - Apollo, Type: Pellet, AA: 18, Use: First Wort, IBU: 40.96
0.25 oz - Apollo, Type: Pellet, AA: 18, Use: Boil for 0 min
0.5 oz - Apollo, Type: Pellet, AA: 18, Use: Dry Hop for 7 days
YEAST:
Fermentis / Safale - American Ale Yeast US-05
NOTES:
Add 2-2.5gm of dry yeast.
This is a 1-gallon preboil batch, which gets me roughly 0.8 gallons into the fermenter after a 15-minute boil. The hopping schedule is designed to maximize the amount of hop flavor and aroma. The brewing software I use (Brewer’s Friend) calculates FWH IBU’s as a 20-minute addition, and I feel that this is a decent approximation of IBU’s here.
Also note that for a relatively high AA% hop you can make a batch using a single 1-ounce bag of hops. Low alpha acid hops might take 2 ounces to hit the IBU level you want.