In medium skillet over medium heat, add 2 tablespoons oil and sweat onion and peppers 2 to 3 minutes then garlic and cook until translucent, about 5 minutes.
In a food processor, pulse together chick peas, red chili flakes, ground cumin, the egg, salt and black pepper to form a coarse consistency. Then add flour, parsley, and cilantro. Pulse until mixture starts pulling from the sides of the food processor.
Remove mixture to a large bowl and mix in the onion mixture. Chill falafel until ready to cook.
Roll falafel dough into 1-inch rounds. Then form rounds into an oblong quenelle shape, like a football.
In a thick-bottomed skillet heat 1/2 inch of canola oil over medium heat to 350 degrees F. Cook falafel balls a few at a time, until golden brown, about 5 minutes. Be sure to turn them so they do not burn or stick to the bottom of the pan. Drain on paper towels and sprinkle with salt while still hot.
Open the pita bread to make pockets. Place 3 to 4 falafels inside. Stuff with lettuce tomato and cucumbers and drizzle sauce generously on the inside. Serve immediately.
Mix the yogurt, lemon zest, lemon juice, cilantro, parsley and cumin together in a small bowl. Add salt to taste. Chill until ready to use.