Green Tomato Jam
["4 1/2 lb. firm, medium-size green tomatoes, cored and cut into slices", "6 c. sugar", "grated rind and juice of 1 lemon", "grated rind and juice of 1 orange"]
["Layer tomatoes alternately with sugar in a large mixing bowl; sprinkle", "with", "citrus", "rind", "and", "juice.", "Cover and let stand at room temperature 8 hours."]
["firm", "sugar", "grated rind", "grated rind"]