Ingredients — Citric acid — Gourmet Gastronomer

A fruit acid used, where a tested formula names it, to acidify tomatoes or figs for canning and to help a pectin gel set — not a free sourness knob.

Citric acid is an organic acid you can buy as a powder. In cooking it is a measured acidifier, not a flavor garnish or a substitute for knowing pH.

NCHFP, adapting USDA home-canning guidance: acidity of a food may be increased by adding lemon juice, citric acid, or vinegar. Tomatoes (and figs) can sit near or above pH 4.6; if they are canned as acid foods they must be acidified to pH 4.6 or lower with lemon juice or citric acid ¹. Do not guess the amount. Use the tested process. Lemon juice is the other named acid in that sentence; they are not interchangeable by taste. Application: Canning and Tomato.

Gel. Ohio State: when a spread needs added acid, the fact sheet names lemon juice or citric acid because acid is required for gel formation, not as perfume ². That is Pectin chemistry on Jam. It is not a license to dump powder into a low-acid vegetable and call it a pickle.

What to notice. Powder is sour and sharp; it does not smell like lemon oil. A jar that tastes tart is not proof of pH 4.6. Acidity is the meter and the line; citric acid is one ingredient some formulas use to get there.

The citric-acid amount depends on the tested process and the fruit. Fig is the other NCHFP example that sits near the line.

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.
Jams, Jellies, and Other Fruit Spreads (HYG-5350) — Treva Williams. Ohio State University Extension. 2015 — Culinary definitions of jam, jelly, preserves, marmalade; pectin/acid/sugar roles; sheet, temperature, and plate tests for doneness. Cites USDA Complete Guide and NCHFP.

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