recipe from joythebaker.com

     from Baking: from my home to yours

1 cup blueberries (fresh or frozen, if frozen, thaw and drain)

1/3 cup sugar, or more to taste

pinch of salt

grated zest and juice of 1/2 lime, or more juice to taste

3/4 cup heavy cream

3/4 cup sour cream

Put the blueberries, sugar, salt, lime zest and juice in a medium saucepan and cook over medium heat, stirring, until mixture boils and the berries pop and soften, about 3 minutes.  

Turn the berries into a bender and whirl until you have a fairly homogenous puree, about 1 minute.  (It will never be completely smooth, and that's fine!)  Add the heavy cream and sour cream and pulse just to blend.  Taste and, if you'd like, and a squirt more lime juice or a tiny bit more sugar.   

Pour the custard into a bowl and refrigerate until it is chilled before churning it into ice cream.