Wash the strawberries and chop off the stalks. Put them in a blender with 1/4 cup sugar and mix till it all looks smooth. Pour the puree through a strainer to remove any lumps. Set aside.
Peel the avocados and chop them in small pieces. Put them in blender and mix till it forms a smooth mixture. You can put 2-3 tbsp of milk here if the mixture looks too thick to blend uniformly. Strain the puree to get rid of any lumps. Set aside.
Prepare the ice cream base
In a bow, mix together the half n half [you can also use whole milk here], vanilla, salt and granulated sugar till sugar is dissolved. Add the cream and mix and finally add the strawberry and avocado puree and mix everything well.
Chill the ice cream mixture for up to 12 hours. I kept this in the fridge for 4-5 hours.
Prepare the ice cream according to your ice cream machine manufacturer's instruction.