This meatless sandwich is full of flavor and good-for-you toppings.
Mix together the mayonnaise, olives, scallions, and a pinch of black pepper in a small bowl and set aside.
Spread the hummus on two slices of pita bread and the mayonnaise mixture on the other two. Layer the cucumber, tomatoes, carrots, and lettuce on top of the hummus. Top each hummus slice with a mayonnaise one. Cut in half. Skewer together the olives, tomatoes, and cucumber and serve on the side.