Step 1 of 6
Two Berry Freezer Jam
Put the raspberries in a large bowl and gently crush with a wooden spoon or potato masher until the fruit is juicy but still slightly chunky.
Tools
Step 2 of 6
Two Berry Freezer Jam
Put the blackberries in a blender and process until well blended, about 1 minute.
Tools
Step 3 of 6
Two Berry Freezer Jam
Place a mesh strainer over the bowl with the raspberries. Pour the blackberry puree into the strainer, and use a rubber spatula to press it through. Continue to press and scrape to strain as much blackberry pulp as possible, leaving mostly seeds in the strainer. You should have about 1 cup of puree.
Tools
Step 4 of 6
Two Berry Freezer Jam
Put sugar, pectin, and salt in a small bowl and stir to combine. Add to the raspberries and blackberry puree. Add the lemon juice and stir constantly for 3 minutes.
PRO TIP Be sure to buy pectin that's designed for freezer jam, as pectin formulas differ for other kinds of jam.
Tools
Step 5 of 6
Two Berry Freezer Jam
Spoon the jam into clean freezer containers, seal with lids, and refrigerate for at least 30 minutes to let jam set up. After 48 hours, jam will be somewhat firmer. Once jam is set, it can be frozen, if desired.
Tools
Step 6 of 6
Two Berry Freezer Jam
Serve on toast, in peanut butter sandwiches, and as a topping for ice cream or fresh peaches. Store in refrigerator up to 1 week or in freezer up to 1 year.