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Blackberry Blueberry Sherbet
From the kitchen of Stephanie Knewasser.  I saw this in Taste of
Home, then changed it a bit.  For a lighter version,  replace the
buttermilk with 1c skim milk and 1c fat free half -n- half.   Use a liquid
measure for the berries, I'm generous.  This is also good with
raspberries, but not strawberries.
In a food processor or heavy duty blender:
2 c frozen blackberries, partially thawed
2 c frozen blueberries, partially thawed
1 c sugar
Process until smooth.

OPTIONAL: strain to remove seeds

Add:
2 c buttermilk
Blend until smooth.

Pour into a 13x9 pan.
Freeze.
Blackberry Blueberry Sherbet
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