Wash all of your produce extremely well! Chop the kale into 1 inch pieces, including the stalks. Chop the apples, removing the core and seeds. Chop the cucumbers and celery into small pieces.
Cut the peel away from the lemons, leaving the pitch and fruit. Cut the lemon into small chunks, removing the seeds.
Feed the kale, apple, cucumbers, celery, lemon, and spinach into the juicer in batches. Mix well and enjoy! Optional: scoop the foam from the top of the juice and discard for a clearer juice.
Drink immediately or store in bottles in the fridge for up to two days.