Which two species account for virtually all commercially traded coffee worldwide?
Coffee Basics
Question · Easy
In the anatomy of a coffee cherry, which layer is immediately surrounding the seed and must be removed during processing?
Thick, dark golden layer on the surface of an espresso shot.
Espresso process
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Chapter 1: Coffee Botany, Origin & Processing
1.1 Coffee Botany & Species
Study guide
Which country has historically been the largest producer of coffee in the world?
Read the clue and guess the term in 6 tries.
Game
What is the defining characteristic of washed (wet) processed coffee compared to natural (dry) processing?
Question · Medium
Mass of dry ground coffee put into the basket before a shot is pulled.
Coffee is botanically classified as what type of fruit?
Approximately what elevation range is associated with high-grown specialty arabica coffee?
Figure written as 1:2 that compares coffee grounds with liquid output.
Recipes
1.2 World Coffee Origins & Terroir
What is the main harvest method used in specialty coffee production to maximize cup quality?
Swap tiles to line up three of the same term.
Term Match
What is chaff in the context of coffee roasting?
Mass of liquid espresso produced from the dry coffee input, usually measured by weight.
What is the standard espresso brewing pressure used in modern espresso machines?
Espresso Fundamentals
A typical modern specialty espresso uses a brew ratio described as 1:2 (normale). For an 18 g dose, what is the target beverage yield in grams?
Milk protein that stabilizes steamed foam and supplies about 80 percent of milk's protein.
Milk science
1.3 Post-Harvest Processing Methods
What extraction time range is typical for a conventional espresso shot after pre-infusion?
Flip two cards at a time to find matching terms.
Term Pairs
What brew water temperature range is typically specified for espresso extraction?
Jet of hot vapor that heats and aerates milk in a pitcher.
A barista pulls a shot that runs in 18 seconds and tastes sour and thin. What is the most appropriate single adjustment?
What is the primary purpose of WDT (Weiss Distribution Technique) in puck preparation?
Filter-brew event that is stronger with fresh coffee because trapped carbon dioxide escapes from the grounds.
Filter brewing
1.4 Coffee Varietals & Green Quality Grading
What is the recommended tamping pressure according to common SCA-aligned guidance?
Find five hidden terms in a grid of letters.
Term Search
Channeling during espresso extraction is best described as:
Gravity-fed method in which water passes through a bed of ground coffee and a filter.
What is the function of a precision (VST or IMS) portafilter basket compared to a stock OEM basket?
What is a typical modern dose range for a double espresso basket?
Arabica variety known for delicate floral, jasmine and peach-like aromas and exceptional quality at high altitude.
Coffee varieties
1.5 Decaffeination Processes
What is pre-infusion on an espresso machine designed to accomplish?
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Which tool is most commonly used to break up static-clumped grounds directly out of the grinder chute before dosing into a basket?
Tall Arabica variety first taken from Ethiopia to Yemen, known for very low production and good cup quality.
What physical difference distinguishes flat burr grinders from conical burr grinders?
Grinder
A shot is running too fast (gushers, pale, watery). Which grind adjustment corrects this?
Reading of how much coffee material a brew carries, used to judge strength.
Extraction theory
1.6 Roast Degree, Solubility & Density
What is grinder retention, and why does it matter?
RDT (Ross Droplet Technique) is used to accomplish what?
Chemical group in coffee divided into organic and chlorogenic categories.
What is the best practice for dosing coffee into a portafilter for consistent espresso?
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