Crack open a bag of coffee and every now and then you'll spot one that looks different — small, round, no flat side. That's a peaberry, and it's one of the more genuinely interesting things happening inside a coffee cherry.
Most coffee cherries grow two seeds side by side, and as they develop they flatten against each other — that's the familiar flat-faced bean shape you're used to. Every so often, only one seed forms inside the cherry. With nothing to flatten it, it grows round instead. That's a peaberry, and it only happens in around 5 to 10% of any harvest, which is exactly why it's treated as something a bit special. Tanzania and Kenya are especially known for sorting and grading peaberries into their own separate lots.
Here's the honest bit, because we'd rather tell you the real story than the marketing one: the round shape itself doesn't change the flavour. Peaberries come from the exact same cherries, trees and harvest as every other bean around them — the difference is structural, not a hidden flavour switch. What the shape does change is how the bean roasts: without a flat side, a peaberry rolls more freely in the drum and absorbs heat more evenly, which can mean a cleaner, more consistent roast.
So what actually decides how a coffee tastes? Altitude, varietal, and process — every time. Higher altitude means the cherries mature more slowly, building denser sugars and more complexity. The varietal sets the flavour ceiling before anything else happens — Red Bourbon, for example, is known for real natural sweetness and body, which is exactly what you'll find in our El Salvador El Borbollón, grown at 1,400 to 1,500 metres on the slopes of the Santa Ana Volcano. Process then decides how clean or fruit-forward the final cup is.
Our own Kenya Toroton happens to be a peaberry grade lot, grown above 1,800 metres in the Nandi Hills by the Toroton Farmers' Cooperative. It's a genuinely stunning cup — but it's stunning because of the altitude, the SL28 and SL34 varietals, and the fully washed process, not because the beans are round. The peaberry grading is a nice bit of coffee trivia to know, not the reason to reach for the bag.
Fancy trying it for yourself? Every bag we sell is freshly roasted to order by Nick in our roastery, just outside Canterbury — never sitting on a shelf waiting for you.