Savory Tomato Jam - cooking recipe

Ingredients

5 lbs ripe tomatoes
4 teaspoons grated lemon zest
1/2 cup lemon juice, fresh (or bottled)
4 cups granulated sugar
2 cups white vinegar
2 teaspoons ground cinnamon
1 teaspoon coarse pickling salt

Preparation

Dip tomatoes into boilnig water for about 1 minute until the skins crack slightly. Peel, remove stem ends and cores and cut up.
Place in saucepan. Bring to a boil slowly. Stir often as it boils in uncovered saucepan. Boil uncovered, about 20-30 minutes until liquid is reduced.
Add lemon rind, lemon juice, sugar, vingar, cinnamon and salt. Stir as it returns to a boil. Boil about 40 minutes, stirring often, until it thickens.
Fill hot sterilized half pint jars to within 1/4 inch of top. Place sterilized metal lids on jars and screw metal bands on securely. For added assurance against spoilage, you may choose to process in a boiling water bath for 5 minutes.