Place the grains and the milk in a glass jar.

Cover with a cloth or coffee filter and affix with a rubber band.

Allow the mixture to sit in a warm place for 24 hours.

Strain the mixture through a non-metallic strainer.

Set the grains aside for making another batch.

Place the strained milk (kefir) in a glass jar with the strawberries.

Cover with a tight fitting lid and allow to sit in a warm place for 24 hours.

Place in the refrigerator to chill for a few hours.

Add the banana and blend in a blender or with a hand blender.

Enjoy!