Skills — Food safety — Gourmet Gastronomer

Keeping food out of the temperature, moisture, and contamination conditions that make people ill — especially when canning, handling dairy, or fermenting.

Food safety is not a mood. Canning, dairy, and many ferments have failure modes that enthusiasm does not cancel. Use the relevant authority and tested process for the food in front of you.

Canning #

NCHFP, adapting USDA AIB 539: Clostridium botulinum can grow in moist, low-acid, low-oxygen food and produce a deadly toxin. Acid foods (pH 4.6 or below) may be boiling-water canned with a researched time. Low-acid foods need a pressure canner at 240–250 °F ¹. Details: Canning and Acidity.

Cooking Jam until it gels is not the same as canning it. The strawberry formula in Strawberry jam (powdered pectin) follows NCHFP, including altitude-adjusted boiling-water times ². If you change fruit, sugar, or acid, you are no longer on that process.

Dairy #

U.S. cheddar identity requires that if dairy ingredients are not pasteurized, the cheese is cured at not less than 35 °F for at least 60 days ³. That is a rule for a standardized commercial cheese, not a home-cheesemaking procedure. Fresh cheeses and raw milk have different, stricter practical risks; an aging chart cannot make those risks disappear.

Fermentation #

Sourdough and wine are not canning. They still fail — off smells, unwanted films, exploding bottles. When a ferment is used as a preservation method, use a tested process: Pickling, Sauerkraut, Fermented pickles, Kimchi. Do not treat bread starter as a model for low-acid canned food.

Selling food from a home kitchen is a different rulebook: Cottage food (California list + local permit). It does not replace a tested canning process.

If two authorities disagree, follow the tested process for your jurisdiction and altitude. Do not average them. Preserving is the craft hub.

Sources & further exploration

Cited in this article

Ensuring Safe Canned Foods — National Center for Home Food Preservation, University of Georgia — Adapted from USDA Complete Guide to Home Canning, AIB No. 539 (revised 2015). Acid vs low-acid foods, pH 4.6, botulinum, boiling-water vs pressure canning.
Strawberry Jam Pectin — National Center for Home Food Preservation, University of Georgia — Tested boiling-water-canned strawberry jam with powdered pectin.
21 CFR § 133.113 — Cheddar cheese — U.S. Food and Drug Administration (text via Cornell LII) — Example standardized cheese: culture, clotting enzymes, cutting/stirring/heating to separate whey, salting and pressing. If dairy ingredients are not pasteurized, the cheese is cured at not less than 35 °F for at least 60 days.

Talk

This encyclopedia is editable like a wiki. Notes stay on the talk layer until they are merged into the page. Questions, comments, and proposed additions are welcome; food-safety numbers still need an authoritative source.

Comment · Priya Nair · 2026-08-27

Keep bread starter out of the canning argument

The fermentation section already says sourdough is not canning. Good. I would keep that wall high. I keep a starter and I also water-bath jam. Those skills share vinegar-and-acid vocabulary in casual kitchens, which is how people get hurt. This page should keep pointing at NCHFP for jars and at tested vegetable ferments for kraut and pickles — not at a flour culture as a model for low-acid food in a sealed jar.

Food safety