Wild berries make the best jams, of course, but if you can't get them, good store-bought berries will do.
- 8 cups washed, hulled strawberries or 12 cups washed blueberries
- 1 1⁄2 cups sugar
- Juice of 1 lemon
In a large saucepan, mix strawberries or blueberries with sugar and lemon juice. Set aside at room temperature for 3 hours. Then, simmer berries over medium-low heat, stirring occasionally with a wooden spoon and skimming foam as it rises, until syrup is thick and berries are soft (crush berries with the back of a spoon), about 15 minutes. Remove from heat and cool for 5–10 minutes.
Sterilize four 1-pt. mason jars by plunging jars, lids, and rims into a pot of boiling water. Drain and set aside to dry. Pour jam into jars and let stand at room temperature to set. (Store in refrigerator for up to 1 month.)