Hot-pack pressure-canning method
Wash tomatoes and okra or zucchini. Dip tomatoes in boiling water 30–60 seconds or until skins split; cool, peel, core, and quarter. Trim okra and slice into 1-inch pieces, or cube/slice zucchini.
Simmer tomatoes for 10 minutes. Add okra or zucchini and boil gently for 5 minutes.
Pack hot mixture into hot jars, leaving 1-inch headspace. Add optional salt and only the tested optional onion amount. Remove air bubbles, adjust headspace, wipe rims, and apply lids.
Pressure can pints for 30 minutes or quarts for 35 minutes. Dial gauge: 11 psi at 0–2,000 ft, 12 psi at 2,001–4,000 ft, 13 psi at 4,001–6,000 ft, 14 psi at 6,001–8,000 ft. Weighted gauge: 10 psi at 0–1,000 ft and 15 psi above 1,000 ft.