In a food processor or high power blender, combine the chickpeas, avocado, lemon juice, garlic cloves, pepper and salt. Turn on the food processor and blend until the avocado hummus is fully pureed and evenly mixed.
One at a time, take a pita half and open it up to form a pita pocket. In each pita half spread 2 heaping tablespoons of the avocado hummus.
Next, layer in the cucumber slices, tomato slices and alfalfa sprouts.