3 cups assorted ripe berries, blueberries, raspberries, blackberries and strawberries
2 tablespoons fresh lemon juice
1½ cups sugar
½ teaspoon butter
Have ready two 8-ounce or one 16-ounce clean jar(s) with lids.
Crush berries to measure 2 cups (a potato masher works well for crushing).
Place 2 cups crushed berries and remaining ingredients in a 2-quart glass measuring cup or 3 quart bowl and stir to combine thoroughly.
Place in microwave (on a plate or paper towels in case of boil-over) and microwave on high 7-8 minutes or until mixture comes to a full boil.
Remove from microwave and stir fruit mixture.
Microwave again, uncovered, on high for 8-9 additional minutes, stirring 2-3 times, until jam begins to coat a spoon and droplets are thick when dripped from the side of a spoon (total microwave time will be 15-17 minutes).
Pour into jars, cool to room temperature and refrigerate. Jam will remain fresh 2-3 months refrigerated.