Cooked Raspberry Jam - CERTO Crystals

Crush raspberries, one layer at a time. Sieve half the pulp to remove seeds, if desired. Measure exactly 5 cups prepared raspberries into large saucepan. Add pectin crystals; mix well.

Bring to boil on high heat. Stir in sugar. Return to boil; cook 1 min. Remove from heat. Stir and skim 5 min. to prevent fruit from floating to surface.

Pour into warm sterilized jars, filling up to 1/4 inch from rims. Cover with lids. Let stand at room temperature 24 hours or until set.