Apple Marmalade
["1 orange", "6 tart apples, peeled, cored and chopped", "3 Tbsp. lemon juice", "5 c. sugar", "1/2 bottle Certo"]
["Quarter unpeeled orange.", "Remove seeds.", "Slice orange to thick slices.", "In a large kettle combine first three ingredients and 2 cups water.", "Bring to a boil and simmer 10 minutes.", "Add sugar and bring to a rolling boil, stirring constantly.", "Continue cooking and stirring until thickened and clear.", "Remove from heat and add Certo.", "Skim off the foam. Pour into hot, sterile jars and seal."]
["orange", "apples", "lemon juice", "sugar"]