a 10-ounce package frozen raspberries in light syrup
thawed
1/2 cup sugar
1/4 cup water
a 10-ounce package frozen sliced strawberries in syrup
thawed and drained
reserving syrup
1 1/2 tablespoons fresh lemon juice
Instructions
In a small heavy saucepan simmer cranberries and raspberries including their syrup, covered, until cranberries have burst, about 10 minutes.
Force mixture through a fine sieve into a bowl, pressing hard on solids, and return liquid to pan.
Stir in sugar, water, strawberry syrup, and lemon juice and simmer, uncovered, until sugar is dissolved and mixture has thickened slightly, 5 to 10 minutes.
Stir in strawberries and simmer until heated through, about 2 minutes.