Halve the pita pockets to form 4 rounds. Cut two of the rounds into ear shapes and arrange rough sides up, on a baking sheet and toast them in a preheated 350° oven for 5 minutes, or until they are pale golden and crisp. Sprinkle half the mozzarella onto the pita and bake for 1 minute, or until the mozzarella is melted. While the pitas are toasting, in a large skillet cook the onion and the garlic in a tablespoon oil over moderately low heat, stirring, until the onion is softened, add the red pepper, broccoli, carrot, zucchini and crushed red pepper, adding more oil if needed. Cook the mixture, stirring, for 4 minutes, or until the vegetables are softened.