Why bag tasting notes change what espresso tastes like
Bag tasting notes change what espresso tastes like because expectation steers perception. In a Royal Coffee experiment, a barista split one brew into two glasses labeled A and B without saying they were identical; six experienced tasters, including Q Graders, wrote different notes for each glass. The barista concluded that when you expect something, your mind shapes reality around that expectation.
Professional protocols guard against the same effect. The Specialty Coffee Association's Coffee Value Assessment separates descriptive assessment from other assessments and aims to conceal extrinsic information about a coffee from the people doing intrinsic assessment. A roaster's bag notes are exactly that kind of extrinsic information.
What you need for a home blind espresso tasting
- Identical cups, so cup shape and color give nothing away.
- Masking tape and a pen, to mark each cup with a code on the bottom or base.
- A helper, ideally, who pulls and codes the shots and hides the bags.
- A notebook or the taste column of the espresso dial-in sheet.
- Water to rinse between cups.
How to set up a blind espresso tasting at home
- Hide the bags. The helper keeps every bag, label and roaster card out of the tasting area.
- Pull the shots on the same recipe. Keep dose, yield and shot time as close as your setup allows, so the blind espresso comparison is about the coffee, not the recipe.
- Code the cups. The helper marks each cup with a code and writes down which coffee got which code, out of your view.
- Vary the serving order. The Royal Coffee write-up raises palate adaptation after the first sample as a possible order effect, so do not always taste the same coffee first.
- Write notes before talking. Each taster writes notes for every code alone before anyone speaks.
- Reveal last. Only after notes are written does the helper reveal the key and read the bag notes aloud.
Blind tasting espresso alone works too: code the cup bottoms, shuffle the cups with your eyes closed, and taste before turning them over. For a single coffee, the rule is simpler: taste the espresso and write notes before you read the bag.
Describing espresso in your own words before reading the bag
Describing espresso without tasting notes is easier with a structure. The SCA's guide to the Coffee Taster's Flavor Wheel, created with World Coffee Research, says to start at the center with a broad category, move outward to more specific descriptors, then return to the center for the next flavor. Write broad words first ("fruity, sweet, heavy body") and move to specifics ("berry") only when the specific is clearly there.
The SCA also defines flavor as a combination of taste and smell, so note espresso taste on the tongue (sour, sweet, bitter) separately from aroma, then body and finish. For a fuller sensory vocabulary, see the coffee tasting guide.
Blind A/B and triangle tests for espresso at home
A blind A/B espresso test serves two coded cups and asks which one you prefer and how they differ. A triangle test serves three coded cups, two of one coffee and one of another, and asks you to pick the odd one out. The triangle format is the more honest check for home espresso, because a real difference has to be found rather than assumed.
The Royal Coffee experiment shows the trap in the A/B format: tasters who expect two samples to differ describe differences even between identical cups. Occasionally serving the same espresso in both the A and B cups is a useful control for a home blind tasting.
Comparing your blind espresso notes with the bag notes
Comparing blind espresso notes with the bag notes is the final step, not the first. Look for agreement at the broad level (fruity, chocolatey, nutty) rather than on exact words, since roaster notes are one taster's description and may come from a different brew method. If your blind notes say sour or bitter where the bag promises sweetness, treat the mismatch as a recipe question: the taste-based extraction diagnosis, sour espresso and bitter espresso guides cover the fixes, and the change goes on the espresso dial-in sheet.
Blind espresso tasting FAQ
How do I blind taste espresso at home?
Have a helper pull the shots, serve them in identical cups marked only with a code, and keep the coffee bags out of sight. Write your own tasting notes for each coded cup before anyone reveals which coffee is which or reads the bag's tasting notes.
Can I blind taste espresso alone?
Yes, with less rigor. Write a code on the bottom of each cup, shuffle the cups with your eyes closed, and taste before turning them over. A single-coffee session also works: taste and write notes before reading the bag.
Why do bag tasting notes change how espresso tastes?
Expectation shapes perception. In a Royal Coffee experiment, experienced tasters given two glasses of the same brew wrote different notes for each glass because they expected a difference. The Specialty Coffee Association likewise keeps extrinsic information away from cuppers doing descriptive assessment.
What is a triangle test for espresso?
A triangle test serves three cups where two are the same coffee and one is different, and the taster picks the odd one out. For espresso at home, serve two shots of one coffee and one shot of another in coded cups.