Drain and rinse the canned chickpeas, then pat them thoroughly dry with a clean kitchen towel to ensure a crispy texture.
In a food processor, pulse the chickpeas, garlic, parsley, cilantro, cumin, coriander, salt, and pepper until the mixture is finely minced but still has some texture.
Transfer the mixture to a medium bowl and fold in the hemp hearts and egg whites until the dough is well-combined and holds together when squeezed.
Divide the mixture into six equal portions and shape them into flat patties, pressing firmly to prevent them from crumbling during cooking.
Heat the olive oil in a large skillet over medium heat and sear the patties for 4 to 5 minutes per side until they are deeply browned and crisp.
While the falafel is cooking, whisk together the Greek yogurt, tahini, and lemon juice in a small bowl until the sauce is smooth and creamy.
Arrange the warm falafel on a plate and drizzle the lemon-tahini sauce over the top for a fresh and satisfying meal.