Lay a slice of lettuce in the bottom of each half of your pita pocket. Spread with about 2 tbsp pizza sauce (I recommend not placing the sauce next to the bread to keep it from getting soggy).
Top with tomatoes, pepperoni, green peppers and cheese (or toppings of your choice).
Devour, dunking in extra pizza sauce if desired.
Notes
Feel free to mix up the fillings as you like! I just try to keep the things with the most moisture away from the pita bread (sauce, tomatoes, etc.) because I don't want soggy bread. If you're packing the pitas and taking for lunch, you can always skip the sauce in the pita and just bring sauce to dip it in.