Step 1 - Removing the tomato skins
Here's a trick you may not know: put the tomatoes, a few at a time in a large pot of boiling water for no more than 1 minute (30 - 45 seconds is usually enough)
then....
Plunge them into a waiting bowl of ice water.
This makes the skins slide right off of the tomatoes! If you leave the skins in, they become tough and chewy in the sauce, not very pleasant.
Step 2 - Removing the skins, bruises and tough parts
The skins should practically slide off the tomatoes. Then you can cut the tomatoes in quarters and remove the tough part around the stem and any bruised or soft parts.
Why remove the skins? They become tough when you cook them! Some people use a juicer and then cook the resultant juice down. It takes more time, but there's nothing wrong with that approach.
Step 3 - Removing seeds and water
After you have peeled the skins off the tomatoes, cut the tomatoes in half. Now we need to remove the seeds and excess water.
Step 4 - Squeeze of the seeds and water
Just like it sounds: wash your hands then squeeze each tomato and use your finger or a
spoon to scoop and shake out most of the seeds. You don't need to get fanatical about it; removing just most will do. Another way to do it is to cut each tomato in half, across it, instead of lengthwise. Then just shake the seeds and juice out.
Add 1 teaspoon of salt per quart to the jars, if desired. Fill jars immediately with hot tomatoes, leaving ½-inch headspace.
Adjust lids and process Step 5 - Combine 1/6 of the tomatoes and bring to a gentle simmer
Combine one-sixth of the tomatoes in a big pot, crushing them with a wooden mallet or spoon as they are added to the pot. This will exude juice. There's generally no need to add liquid, most types of tomatoes have so much water.
Continue heating the tomatoes, stirring to prevent burning.
Once the tomatoes are boiling, gradually add remaining quartered tomatoes, stirring constantly These remaining tomatoes do not need to be crushed. They will soften with heating and stirring. As they cook, the tomatoes will fall apart into sauce with out much need of crushing or mushing!
Step 6 - Continue to add the rest of the tomatoes
Continue until all tomatoes are added. Then boil gently for 5 minutes.
Step 7 - Add 2 Tablespoons of lemon juice and liquid to each empty jar
Before you fill each jar with tomatoes, add 2 tablespoons of lemon juice. This helps to reduce the odds of spoilage and to retain color and flavor. T
Step 8 - Fill the jars with heated tomatoes
Let the tomatoes cool to room temperature, then fill your freezer containers (I like Ziploc freezer bags in the quart size), fill them completely, eliminate air pockets, seal them and pop them in the freezer. You're done!