Tomato Jam
["3 c. prepared tomatoes (about 2 1/4 lb. fully ripened)", "1 1/2 tsp. grated lemon rind", "1/4 c. lemon juice", "2 lemons, cut up", "6 1/2 c. sugar (2 lb. 14 oz.)", "1 bottle Certo fruit pectin"]
["First, prepare tomatoes.", "Scald, peel and chop about 2 1/4 pounds fully ripe tomatoes.", "Bring to a boil and simmer 10 minutes.", "Measure 3 cups into a large saucepan.", "Add lemon rind, lemon juice and cut up lemon pieces.", "To the measured fruit in the saucepan, add the sugar.", "Mix well.", "Place over high heat; bring to a full, rolling boil and boil hard for 1 minute, stirring constantly.", "Remove from heat; at once stir in Certo fruit pectin. Skim off foam with metal spoon, then stir and skim for 5 minutes to cool slightly to prevent floating fruit.", "Ladle into glasses. Cover at once with 1/8-inch hot paraffin."]
["tomatoes", "lemon rind", "lemon juice", "lemons", "sugar"]