Canning Tomatoes

Home-canned tomatoes bring a garden-fresh taste to soups, stews,
chilies, and spaghetti sauces all year long. 

For each quart of canned tomatoes, you will need 2-1/2 to 3-1/2
pounds fresh tomatoes. Choose unblemished tomatoes for canning
and wash well in cold water.

20-24 lb. tomatoes (allow 2-1/2 to 3-1/2 lb. tomatoes per qt.)
1 T. lemon juice (pint jar) 2 T. lemon juice (qt.
jar)

Peeling Tomatoes

Wash firm unblemished tomatoes. To remove the skins, dip tomatoes
in boiling water for 30 seconds or until the skins start to split.
Immediately place the tomatoes in cold water. When cool enough to
handle, remove the skin and core with a paring knife. If you like cut the
tomatoes in half. Be sure to save any juices.

Filling jars with tomatoes

Place a wide-mouth funnel in a hot, clean pint or quart canning jar.
Ladle whole or halved tomatoes into the jars along with any juices
from preparing the tomatoes. Add 1 tablespoon lemon juice to each
pint jar or 2 tablespoons lemon juice to each quart jar. The lemon juice
raises the acidity of the tomatoes to ensure safe canning. Add boiling
water, leaving 1/2-inch headspace.

Sealing jars

Remove the funnel; wipe the jar rim with a clean, damp towel to
remove all traces of food. Food on the rim prevents a perfect seal.
Position the prepared lid and screw band on the jar and tighten
according to the manufacturer's instructions. Set each jar into the
canner as it is filled. The jars should not touch. Cover the canner. You
will need to process the tomatoes in a boiling-water canner for 40
minutes for pints and 45 minutes for quarts. Begin timing when the
water returns to boiling.

Checking the seal

When the jars have cooled, press the center of each lid to check the
seal. If the dip in the lid holds, the jar is sealed. If the lid bounces up
and down, the jar isn't sealed. Unsealed jars should be stored in the
refrigerator and used within 3 days, or you can reprocess the
tomatoes within 24 hours. Label the jars with contents and date. Your
tomatoes with keep their optimum quality for 1 year.

from:  Better Homes & Gardens