Super simple, put all ingredients in a blender and blend until smooth. Add water if too thick, or more ice cubes for a colder and more refreshing smoothie.
Alternatively, juice the apples first and add to the other ingredients, then blend.
Drink immediately after blending, or smoothie will thicken up and need to be eaten with a spoon!
Notes
Use your favourite in-season apples; I used Pink Lady, abundantly sweet and not very acidic
Recipe by @OmNomAlly at https://omnomally.com/2012/02/11/strawberry-chia-smoothie/