Bring boiling-water canner, half full with water, to simmer. Wash jars and screw bands in hot soapy water; rinse with warm water. Pour boiling water over flat lids in saucepan off the heat. Let stand in hot water until ready to use. Drain well before filling.
Peel and chop tomatoes. Place in saucepan. Bring to a boil. Reduce heat to low; cover and simmer 10 minutes, stirring occasionally. Measure exactly 3 cups prepared fruit into 6- or 8-quart saucepot. Add lemon zest and juice.
Stir pectin into tomato mixture in saucepot. Add butter to reduce foaming, if desired. Bring mixture to full rolling boil (a boil that doesn't stop bubbling when stirred) on high heat, stirring constantly. Stir in sugar. Return to full rolling boil and boil exactly 1 minute, stirring constantly. Remove from heat. Skim off any foam with metal spoon.
Ladle immediately into prepared jars, filling to within 1/4 inch of tops. Wipe jar rims and threads. Cover with 2-piece lids. Screw bands tightly. Place jars on elevated rack in canner. Lower rack into canner. (Water must cover jars by 1 to 2 inches. Add boiling water, if necessary.) Cover; bring water to gentle boil. Process 10 minutes. Remove jars and place upright on a towel to cool completely. After jars cool, check seals by pressing middle of lid with finger. (If lid springs back, lid is not sealed and refrigeration is necessary.)
Spiced Tomato Relish
Prepare as directed, adding 1/2 tsp. each ground allspice and ground cinnamon and 1/4 tsp. ground cloves with the lemon juice. Or, substitute 1 Tbsp. Worcestershire sauce for the allspice and cloves.
At altitudes above 1,000 feet, increase processing time as indicated: 1,001 to 3,000 feet-increase processing time by 5 minutes; 3,001 to 6,000 feet-increase processing time by 10 minutes; 6,001 to 8,000 feet-increase processing time by 15 minutes; 8,001 to 10,000 feet-increase processing time by 20 minutes.
Calories From Fat
% Daily Value*
Total Fat 0g
Saturated Fat 0g
Trans Fat 0g
Total Carbohydrates 45g
Dietary Fibers 1g
* Percent Daily Values are based on a 2,000 calorie diet.
6 jars, about 1 cup each
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.