Grape Jelly (prepared with bottled grape juice)

Prep Time: 30 min
Total Time: 30 min
Serves: about 4 (1-cup) jars or 64 servings, 1 Tbsp. each

Ingredients:

2 cups bottled grape juice
3-1/2 cups sugar, measured into separate bowl
1/2 tsp. butter or margarine (optional)
1 pouch CERTO Fruit Pectin

Preparation:

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.
Pour juice into 6- or 8-quart saucepot.
Add sugar; mix well.
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 pectin.
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 1/8 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 5 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.)