About

Hi, I’m Nathan Kessler

I’m the founder of Ferment. I started fermenting at home the way most people do — one nervous jar of sauerkraut, a lot of Googling, and a constant nagging question: is this normal?Ferment is the answer I wish I’d had: a calm, visual companion that tells you what’s happening in your jar and what to do next.

How these guides are made

Everything on this site is written from hands-on experience with real batches — sauerkraut, kimchi, brined pickles, and the occasional failure worth learning from. I’m a home fermenter, not a food scientist, so anything touching food safety (pH, salt ratios, botulism, what to keep and what to toss) is checked against established sources, including the National Center for Home Food Preservation and the USDA. When a guide is updated, the date on the post changes with it.

Why Ferment exists

Most first ferments don’t fail — they just feel uncertain. The goal here is to replace that panic with confidence, whether you use the free salt calculator, the mold-vs-kahm checker, the guides, or the app.