Blackberry Buttermilk Sherbet

Ingredients

 * 1 lbs bag frozen, unsweetened
 * -blackberries
 * 1 each egg
 * 1 dash salt
 * 1/8 tsp stevia reubadiana extract
 * or
 * 5 evn. aspartame sweetener
 * 2 cup buttermilk

Directions
Source: diabetic sweet tooth cookbook by mary jane finsand,