Cut avocado in half. Puree one of the halves and leave the second half on the side.
Cut pita in half. Top each pita half with an equal amount of pureed avocado. Remove seeds from tomato and dice. Sprinkle tomatoes pieces over 4 halves of the pita.
Slice the other avocado 1/2 into 4 slices, then cut each quarter into smaller pieces before adding it to the pita half. Top the "loaded" pita half with its other side like a sandwich, push down slightly to blend ingredients of pita sandwich.