The Roastery Lab · Field Notes
From the field
Where the lab teaches — the cast-iron origin, home-roast guides, and the craft behind the cup.
These are the notes we'd hand a friend across the counter: where Pacific Roots began, how to roast on a stovetop, and the few habits that quietly fix most cups. Honest craft, plainly told — nothing here reports a measured batch we haven't run yet.
Pacific Roots lives between two Californias — morning fog on the San Luis Obispo coast, and alpine light in the Eastern Sierra.
It began the way good labs do: at home, with a cast-iron skillet, a notebook, and a question — why was one roast wonderful and the next one merely fine? The answer turned out to be data. Charge temps, turning points, first crack, development ratios, rest windows. Written down, plotted, compared, cupped.
Cast iron · a notebook · a question
Roast science, kitchen scale.
A weekend-friendly way in: the real roast phases, a skillet, and a timer. No drum roaster required — just attention.
1
Measure small
50–70 g green (about ⅓–½ cup) — a small batch is an even batch.
2
Preheat
Empty cast-iron skillet, medium-low, 3–4 minutes.
3
Stir constantly
Add beans and never stop moving them.
4
Watch for yellowing
~2–4 min: green → yellow, grassy smell leaves.
5
Build first crack
~6–8:30: audible pops — development begins.
6
Control the heat
Smoking hard? Lower it. Heat lag is real in iron.
7
Stop at target
For medium-plus: 15–120 s after first crack begins.
8
Cool fast & rest
Colander + fan, then 24–48 h rest before judging.
The golden rule
Keep the beans moving. Small batch + steady stirring = more even roasting. Stop before active second crack for a sweeter, less smoky cup.
The small habits that move a cup more than any gadget — true whatever you brew.
Habit 01
Grind fresh
Aromatics start leaving ground coffee in minutes, not days. Grind right before you brew and the same beans taste like more coffee.
Habit 02
Keep the beans moving
On a stovetop, even color comes from constant motion — a small batch you never stop stirring beats a big one you can't keep up with.
Habit 03
Rest before you judge
Fresh-off-the-roaster is a myth. Give beans 24–48 hours to gas off — longer for espresso — before you decide what they taste like.
The notebook is open — read the full science, or start your own.