Sovereign Coffee Barista Study Guide

Milk Science: Aeration → Stretching → Microfoam

Understanding & Know-How

Aeration

Introducing air into the milk from the steam wand. Simple concept, easy to mess up.

Tiny amounts of air incorporated into cold milk
Bubbles bind to proteins (casein micelles)
Sets the foundation for microfoam — sloppy aeration = sloppy texture

Stretching / Tearing

Controlled, intentional air introduction. Some shops say “stretch,” others “tear.” Same thing.

Milk expands ~15–25% depending on stretch
Still the aeration phase, emphasizing volume added
Sovereign-level: early and brief — every hot milk drink gets the same microfoam

Microfoam

Velvety, paint-like texture suited for latte art and smooth mouthfeel.

Proteins denature & bond around tiny bubbles
Fat stabilizes the foam
Shiny, glossy — like wet paint. Zero visible bubbles.

Sound & Wand Placement

Right: soft, controlled “tss-tss-tss” kisses of air
Wrong: a ripping scream
Wand tip sits just below surface — not submerged, not on top

Raw Milkflat

→

Aeratebig bubbles

→

Microfoamglossy

📌

Everything up to this point is important to know. Everything from here on must be memorized.

Milk Steaming Temperatures

Memorize the temperature · the seconds · the hand test

CoolerHotter

130°F

145°F

160°F

160+°F

Cortado

130°F

Hand test: hold 5 seconds before too hot

Turn-off cue: pitcher becomes VERY warm

~5 sec hold

Cappuccino / Macchiato

145°F

Hand test: hold 2 seconds before too hot

Turn-off cue: VERY HOT — must let go

~2 sec hold

Latte

160°F

Hand test: hold 1 second before too hot

Turn-off cue: let go, then wait for a “change of pitch” (trained in person)

~1 sec hold

Call-In / Delivery / “Extra Hot”

160+°F

Hand test: hold 0.5 seconds before too hot

Turn-off cue: let go, then wait for a “deep change of pitch” (trained in person)

~0.5 sec hold

Memory Anchor

Cooler drink → longer you can hold the pitcher (5 → 2 → 1 → 0.5 sec)
Cortado is the only one you can hold for a real beat — everything above gets hotter fast
Pitch is your backup signal above 160°F when your hand has to let go

Coffee Parameters

Memorize the dose & temperatures

Pour Over

Parameter	Spec
Dose	24–24.5 g
Water Temp	197°F (iced and hot)

Drip Coffee

Batch Size	Coffee
Half (small) batch	115 g
Full (large) batch	230 g

Cold Brew

Parameter	Spec
Coffee	303 g per gallon of water
Brew Time	11.5–12 hours
Serving	16 oz cup only — 260 g cold brew, filled with ice

Nitro Cold Brew

Parameter	Spec
Cold Brew	330 g in canister
Nitrogen Charger	1 per drink — shake canister aggressively before pouring
Serving	12 oz cup only — no ice, serve immediately

Espresso

Set-up, service & variable parameters

Espresso Set Up — Serving a Guest

Element	Spec
Set Up	Demitasse cup and saucer, with a side of sparkling water in a Gibraltar glass
Hand Off	Always lead with the origin, then the tasting notes on the bag

Example: “Today we have a Kenyan with notes of sundried tomato, raspberry, and green apple. Enjoy.”

Espresso Variable Parameters

Must be memorized once introduced in “Beginner Espresso Training.”

Parameter	Spec
Dose	16–18 g
Yield	2.1–2.5 × dose
Time	15–35 seconds, depending on recipe and conditions

Yield example: 16 g dose → 33.6–40 g yield

Yield at a Glance

16 g dose2.1×

33.6 g

min yield

18 g dose2.5×

45 g

max yield

Under

Under-extracted

Sour, sharp, thin. Too fast or too coarse.

Ideal

Dialed In

Balanced, sweet, syrupy. Correct dose, yield & time.

Over

Over-extracted

Bitter, dry, harsh. Too slow or too fine.

Matcha

Powder, water & kettle temperature

Matcha Build

Parameter	Spec
Matcha Powder	2–2.5 g
Water	38–40 g
Kettle Temp	171°F (matcha kettle)

Why 171°F?

Matcha is delicate — lower than pour-over’s 197°F. Too hot and it turns bitter and grassy.

Powder is measured in grams, not scoops
Water is light — just enough to whisk into a smooth paste before milk

Iced Drink Ratios & Cold Foam

Milk drops 40 g per size step until 4 oz

Milk by Size

16 ozUpsized Latte

220 g

12 ozLatte

180 g

8 ozShakerato / Short Iced Latte

140 g

4 ozUndertow / Iced Cortado

70 g

Pattern: −40 g per size step. The 4 oz is half the grams of the 8 oz.

Light ice, more milk: +40 g of milk, any size (extra charge)
Iced chai & iced chocolate: +40 g of milk (no extra charge)

Cold Foam

Parameter	Spec
Cold Foam	80 g
Total Milk (drinks with cold foam)	180 g
Default Syrup	22 g
Serving Size	16 oz cups only — to accommodate all components

Reading the Cold Foam Build

180 g total milk = the drink’s base milk
80 g of that becomes the foam layer on top
Default syrup matches the 12 oz standard (22 g)
16 oz only — all components need the room

Syrup & Sweetener Standards

12 oz is your anchor: +11 g per step up, −4 g per step down

Size	Syrup	Used For
Extra shot	+11 g	Any drink when a customer requests an extra shot (default size 16 oz)
16 oz	33 g	Upsized lattes, americanos, matcha, cold brew, iced teas, etc.
12 oz	22 g	Lattes, matcha, nitro (avoid flavoring nitro — recommend a latte or regular cold brew instead), hot teas, americanos
8 oz	18 g	Cappuccinos, shakerattos, short americanos
4 oz	14 g	Cortados, undertows
3 oz	10 g	Macchiatos
2 oz	6 g	Anyone who adds syrup to a straight shot of espresso

Rule: sizes above 12 oz increase by 11 g per step up; sizes below 12 oz decrease by 4 g per step down. Use these unless a drink explicitly states otherwise (e.g., some seasonal drinks).

Alternative Sweeteners

Stevia — extremely concentrated

Drink Size	Stevia
4 oz	1 g
8 oz	2 g
12 oz	3 g
16 oz	4 g

Agave

Naturally sweeter than all standard syrups
Subtract 4 g from the standard syrup measurement for that drink size

Chai & Chocolate

Adding Syrup to a Chai Latte

Half chai, half requested syrup.

Example: Mexican Vanilla into a 12 oz iced chai → 11 g Mexican Vanilla + 11 g chai concentrate.

Hot Chai / Hot Chocolate

Follow Syrup & Sweetener Standards
Hot: pour ~40 g steamed milk and stir to fully incorporate before pouring the rest

Dialed vs. Undialed Shots

Shot puller manages both sides · FIFO from the outermost shot

Machine Layout

LEFT

⚫⚫

UNDIALED

RIGHT

⚫⚫

DIALED IN

A dialed-in shot is a perfectly executed shot as determined by the shot puller. Always pull from the outermost shot to maintain FIFO.

Category	Definition
Dialed In	Purist sweeteners, or any half-sweet drink (agave, honey, simple syrup, stevia, brown sugar)
Undialed	Non-purist sweeteners — sweetener + added flavor (Mexican vanilla, banana, lavender)
Dialed In — Freshest Shot	Any drink 8 oz or below (any sweetener)

Tea Measurements

Iced Tea

200 ml

Hot Tea

400 ml

Hot London Fog
or any tea with steamed milk

300 ml

Food Heating Guidelines

Pastries

15–20 seconds in microwave
15 sec for anything with a glaze

Non-Pastry Foods

Item	Time
Croissant sandwiches	30 sec
Kolaches, meal preps, empanadas	1 min
Bagels	Setting 4.5 & 3 min timer as a reminder (cut in half with bread knife)

Milk Science: Aeration → Stretching → Microfoam

Aeration

Stretching / Tearing

Microfoam

Sound & Wand Placement

Milk Steaming Temperatures

Coffee Parameters

Pour Over

Drip Coffee

Cold Brew

Nitro Cold Brew

Espresso

Espresso Set Up — Serving a Guest

Espresso Variable Parameters

Yield at a Glance

Under-extracted

Dialed In

Over-extracted

Matcha

Matcha Build

Why 171°F?

Iced Drink Ratios & Cold Foam

Milk by Size

Cold Foam

Reading the Cold Foam Build

Syrup & Sweetener Standards

Alternative Sweeteners

Chai & Chocolate

Dialed vs. Undialed Shots

Machine Layout

Tea Measurements

Iced Tea

Hot Tea

Hot London Fogor any tea with steamed milk

Food Heating Guidelines

Pastries

Non-Pastry Foods

Hot London Fog
or any tea with steamed milk