How Should Parameters Be Adjusted When Making Dark Roast Coffee with AeroPress?

Making Rich-Bodied Coffee with AeroPress

We have previously used the AeroPress to make flavor-focused coffee, so today let's try to make a cup with a rich, full-bodied texture.

AeroPress extraction is based mainly on immersion, so the resulting coffee tends to be quite balanced. But that raises a question: when using the AeroPress for a dark-roasted coffee, how should the parameters be adjusted to get a cup that is both rich-bodied and balanced?

Experiment

Today's experiment uses FrontStreet Coffee Jamaica Blue Mountain beans, a washed Typica from Jamaica's Clifton Mountain Farm. We normally choose a medium-dark roast to highlight its rich body and its balanced acidity, sweetness, and bitterness.

FrontStreet Coffee Jamaica Blue Mountain

Country: Jamaica
Estate: Clifton Mountain Farm
Altitude: 1,310 meters
Processing: Washed
Variety: Typica
Roast Level: Medium-Dark

I first tried my usual pour-over parameters, changing only the coffee-to-water ratio while keeping everything else the same, using the inverted pressing method.

Parameters: grind size BG 6M (50% pass-through rate on a China-standard #20 sieve), water temperature 85 degrees C.

Coffee-to-Water Ratio 1:14

Add 16 g of coffee grounds to the AeroPress, pour 223 g of hot water, and stir 5 times to ensure full contact between coffee and water. Stir 5 more times at the one-minute mark, then invert and press at 1 minute 30 seconds. Total time: 1 minute 50 seconds.

Flavor: the aroma carries a subtle chocolate scent. The palate reveals milk chocolate, nuts, and cream. As the temperature drops slightly, a distinct tropical fruit acidity emerges with a slight astringency. Overall it feels relatively refreshing.

Coffee-to-Water Ratio 1:13

Add 16 g of coffee grounds to the AeroPress, pour 203 g of hot water, and stir 5 times to ensure full contact between coffee and water. Stir 5 more times at the one-minute mark, then invert and press at 1 minute 30 seconds. Total time: 1 minute 45 seconds.

Flavor: the aroma has chocolate notes. The palate shows chocolate and nut flavors with some floral notes and a smoky sensation. As the temperature drops slightly, berry acidity emerges. The texture is relatively richer and fuller.

At a 1:14 ratio the FrontStreet Blue Mountain shows distinct acidity and sweetness with a fairly refreshing mouthfeel, while at 1:13 it feels fuller-bodied and the fruit acidity is less prominent. In both cases, though, the chocolate and nut character were not very pronounced, so I tried a finer grind, BG 6A, to see how the Blue Mountain flavor would come out.

Parameters: grind size BG 6A (54% pass-through rate on a China-standard #20 sieve), water temperature 85 degrees C.

Coffee-to-Water Ratio 1:14

Flavor: the palate shows berry acidity, subtle chocolate, and tea-like notes with a faint fermented aroma. The texture is relatively thin, with bright fruit acidity.

Coffee-to-Water Ratio 1:13

Flavor: the palate reveals dark chocolate, herbal notes, a smoky sensation, and soft berry acidity. The aftertaste carries nutty aromas with caramel sweetness, and the texture is rich and smooth.

After adjusting to BG 6A, the fruit acidity was less bright but the sweetness was insufficient. So I kept adjusting, setting the grind to BG 5R, my usual pour-over grind, to see the result.

Parameters: grind size BG 5R (58% pass-through rate on a China-standard #20 sieve), water temperature 85 degrees C.

Coffee-to-Water Ratio 1:14

Flavor: the palate shows soft fruit acidity with cocoa, nut, and cream flavors. The texture is on the thinner side, but the sweetness is noticeable.

Coffee-to-Water Ratio 1:13

Flavor: the palate reveals soft citrus acidity with cocoa and cream. Caramel sweetness is prominent, and overall the cup is well balanced with a rich, full body.

After trying three grind sizes and two ratios, I found that at BG 6M, the AeroPress FrontStreet Blue Mountain had more prominent fruit acidity and was overall more refreshing at both 1:14 and 1:13; at BG 6A, the chocolate and nut flavors were more distinct, with softer fruit acidity but slightly less sweetness; and at BG 5R, the cocoa, nut, and caramel flavors were very pronounced, with outstanding sweetness.

Because I kept the extraction time within two minutes when making AeroPress coffee, the contact time was relatively short, which meant I could use a finer grind to increase the contact area between grounds and water and improve the extraction rate.

My suggestion: when using the AeroPress for a dark roast, try a medium-fine grind with a 1:13 coffee-to-water ratio and a short extraction time.

FrontStreet Coffee Recommendation

The coffee in this experiment, FrontStreet Coffee's Jamaica Blue Mountain No. 1, is itself the ideal dark-roast candidate for the AeroPress. Sourced from the historic Clifton estate with full origin certification and traditional wooden-barrel packing, it is roasted medium-dark to unite the classic Blue Mountain balance of acidity, sweetness, bitterness, and aroma into a rich, layered cup of chocolate, roasted nut, cream, and caramel with a persistent fruit sweetness.

If you want a more everyday dark roast with the same full body, FrontStreet PWN Golden Mandheling is worth trying: a deep-roasted Sumatran with very low acidity, a thick, lingering mouthfeel, and plenty of herbal and dark chocolate aroma, well suited to the rich, balanced style the AeroPress produces. Whichever you use, keep the brew water at 85 degrees C and follow the 1:13 medium-fine recipe above for the fullest body.