Roast craft journal

Lots that shaped our curve

These stories are illustrative — anonymised accounts of how we roast, cup, and release coffee at our Singapore atelier. They are current tasting readings, not promises of future results.

Roaster drum at RoastRush micro-roastery

How we work

Cupping stays in the loop

Every story below passed through the same loop: sample roast, cup at twelve and twenty-four hours, adjust development, full batch, rest, cup again before service. We do not publish named farm medals or claim competition superiority — only what the table told us on the week we released the lot.

A washed lot that needed longer development

The first sample roast cupped sharp and grassy at day five — classic under-development despite an attractive colour reading on the tray. First crack had arrived early and we dropped on habit rather than curve. The second sample extended development by forty seconds with a lower charge temperature, holding rate-of-rise steady through mid-phase. At day eight the cup showed citrus and panela without the vegetal edge. We scaled to a six-kilo batch, marked the bags with the later roast date, and held filter service until day ten. Guests who bought early received a note on the bag suggesting waiting — honesty costs less than refunds.

A natural that smelled loud on the tray

Naturals deceive on the cooling tray. This lot smelled like strawberry jam at drop — staff were enthusiastic before the first cupping bowl cooled. At day three the same coffee tasted thin and perfumed, all aroma and no structure. We delayed retail release, cupped daily, and found structure arriving around day twelve in Singapore humidity. At the filter bar we opened grind one notch coarser and lowered water temperature two degrees to tame the ferment note without killing sweetness. The lot never became subtle — but it became drinkable, which was the brief.

A River Valley office subscription after humidity week

An office three streets from Kim Yam had been on a fortnightly subscription of our batch-brew lot. During a humid week their kitchen storage softened the coffee faster than our test kitchen predicted. Complaints were polite but clear: "tastes fine here, flat upstairs." We visited, moved their storage off a window ledge, adjusted the subscription to smaller bags delivered weekly, and swapped one origin for a more forgiving washed lot with longer development. No contract penalty — just a rebuild. Subscriptions are relationships, not software licences.

A decaf that finally cleared the mute cup

Decaf often smells better on the tray than in the cup. Our sugar-cane decaf sample tasted woody at standard development. We slowed the roast after first crack, accepted a lighter colour, and extended rest to sixteen days before service. Espresso still lacked body — we never promised that — but filter showed chocolate and orange peel at a ratio guests could repeat at home. We label decaf clearly on the calendar so no one orders it expecting the same jolt as a caffeinated lot — we sell coffee flavour, not stimulant theatre.

Green coffee samples sorted before roasting at RoastRush

Green stage

Before the drum

Moisture, density, and screen size determine whether a lot gets a development-forward curve or a gentle charge. We reject greens that cup musty at sample — no roast curve fixes mould.

Taste with us at the table