Pulse the chickpeas in a food processor until they are broken down into small crumbles but not yet a smooth paste.
In a large mixing bowl, combine the ground turkey, pulsed chickpeas, chopped parsley, minced garlic, cumin, coriander, salt, and pepper.
Shape the mixture into four thick, even patties using your hands to ensure they are well-compressed.
Heat the olive oil in a large skillet over medium-high heat until the oil is shimmering.
Place the patties in the skillet and cook for 5 minutes per side until they are deeply browned and the turkey is cooked through.
Whisk together the tahini, lemon juice, and water in a small ramekin until the sauce reaches a creamy, pourable consistency.
Serve the hot falafel patties immediately on a plate with the lemon-tahini sauce drizzled over the top.