Wash all the ingredients thoroughly to remove any dirt or residues. Prepare the vegetables by trimming the kale leaves, slicing the cucumber, and peeling the lemon. Feed the ingredients through a juicer, starting with the leafy greens (kale, parsley, spinach) to maximize their yield, followed by the cucumber, lemon, celery, and ginger. Once juiced, stir the liquid well to combine all the flavors. Pour into a glass and enjoy immediately to retain maximum freshness and nutrients.