1 (16-ounce) package solidly frozen unsweetened raspberries
1/3 cup superfine sugar
1/4 cup solidly frozen limeade concentrate or 1/4 cup solidly frozen lemonade concentrate and finely grated zest of 1/2 lime
2 tablespoons Grand Marnier or 2 teaspoons orange extract
1 (5-ounce) can refrigerator-cold fat-free evaporated milk
If the ice cream is to be soft and fluffy, the raspberries must be frozen hard and the evaporated milk refrigerator-cold.