Combine the first 10 ingredients in a food processor and pulse until you are left with a well blended, wet mixture.
Heat olive oil in large skillet over medium high heat. Use a ¼ cup scoop and scoop falafel mixture into the oil, press down with the back of the measuring cup to flatten some. Cook 3-4 minutes per side, until golden brown.
Remove from oil and drain on a paper towel.
Garlic Yogurt can be made in advance just mix all ingredients together (yogurt, garlic, and dill) and allow to meld together in the fridge until ready.
Top each pita with two falafel patties, ¼ cup arugala, and spoon garlic yogurt on top.
Recipe by Supper for a Steal at http://supperforasteal.com/falafel-pitas/