This is a test of commonsense. Complete the next sentence:

How to make aloe vera juice
Gather the ingredients.
You will need :
Aloe barbadensis miller plant 1 tablespoons (15ml) of white vinegar (optional) 1 cup (8 oz) water (optional) 1 cup (8 oz) of any citrus based juice.
Break off a few leaves from an aloe barbadensis miller plant.
Take a sharp knife and carefully peel the rind from the plant leaves and discard. Peel the yellow layer just beneath the rind with a sharp knife and discard.