Prepare and press tomatoes as for tomato juice.
Simmer until reduced by about one-third for thin sauce or one-half for thick sauce.
Add required bottled lemon juice or citric acid directly to each jar; do not omit acidification.
Fill hot jars with hot sauce, leaving 1/4-inch headspace; adjust lids.
Process using the tested NCHFP boiling-water or pressure-canning schedule for jar size and altitude.