Overnight Chickpea Hydration: The day before, place the dried chickpeas and baking soda in a large bowl. Cover with at least 3 inches of cool water. Let them soak on the counter for a minimum of 18 hours. The chickpeas should swell significantly and become tender enough to easily break with your fingers.
Grain & Walnut Preparation: Cook the rinsed quinoa according to package directions; set aside to cool completely. While the quinoa cooks, place the walnuts in a dry skillet over medium heat. Toast for 3-5 minutes, shaking the pan frequently, until fragrant. Let cool, then add to a food processor and pulse into a fine, sandy meal. Transfer the ground walnuts to a small bowl.
Aromatic Base Infusion: Drain the soaked chickpeas thoroughly and pat dry. In the now-empty food processor bowl, combine the red onion, garlic, parsley, cilantro, dill, lemon zest, cumin, coriander, smoked paprika, sumac, and sea salt. Pulse until a coarse, fragrant paste forms.
Chickpea & Quinoa Integration: Add the dried chickpeas to the aromatic base in the food processor. Pulse in 1-minute intervals, scraping down the sides as needed, until the mixture is finely minced but not a smooth puree—some texture is desirable. Transfer the mixture to a large mixing bowl. Fold in the cooked quinoa and ground walnuts.
Binding & Moisture Control: Place the grated zucchini in the center of a clean kitchen towel. Gather the ends and twist tightly over a sink to squeeze out as much liquid as possible. Add the dry zucchini pulp to the falafel mixture along with the baking powder and whole wheat flour. Mix gently until just combined. Cover and refrigerate for at least 1 hour to allow the flavors to meld and the mixture to firm up.
High-Heat Roasting & Finishing: Preheat your oven to 400 F / 200 C. Drizzle 1 tbsp of olive oil onto a large baking sheet and spread to coat the surface. Place the sesame seeds in a shallow bowl. Using a 1.5 tbsp cookie scoop or your hands, form the chilled mixture into 24 small patties, about ½-inch thick. Gently press the top of each patty into the sesame seeds to coat one side. Arrange the patties on the prepared baking sheet, seed-side up. Brush the tops with the remaining 1 tbsp of olive oil. Bake for 10-12 minutes, then carefully flip. Bake for another 8-10 minutes, until the falafels are deeply golden-brown and crisp on the outside. Serve immediately.