Why we culture our butter for 18 hours

Most American butter is churned within hours of pasteurization. It's fine — sweet, mild, the butter you grew up with. But it's missing the complexity that makes French and Irish butter sing.

The trick is fermentation. Before the cream ever sees a churn, we add live cultures and let it sit at 68°F for 18 hours. The cultures consume lactose, produce lactic acid, and develop the tangy, almost cheesy depth that defines our butter.

Why 18 hours specifically

Less than 12 hours and the cultures haven't done enough work — the butter tastes almost identical to uncultured. More than 24 hours and it tips into yogurt territory. 18 hours is the sweet spot: bright, tangy, but still unmistakably butter.

What you taste

The first thing people notice is the aroma — it's almost cheesy, in a good way. Then the tang on the tongue, especially at the back of the palate. Finally, the finish: longer than uncultured, with a nutty warmth from the extended fermentation.