Prepare the falafel mixture: In a food processor, combine chickpeas, onion, garlic, parsley, cilantro, cumin, coriander, salt, and pepper. Pulse until the mixture is well combined but still slightly chunky. Transfer the mixture to a bowl and stir in 2 tablespoons of flour. If the mixture is too wet, add another tablespoon of flour. Shape the mixture into 12 small patties.
Cook the falafel: Heat vegetable oil in a frying pan over medium heat. Once hot, carefully add the falafel patties in batches, cooking for about 3-4 minutes per side until golden brown and crispy. Alternatively, you can bake the falafel in a preheated oven at 375°F (190°C) for 20-25 minutes, flipping halfway through.
Prepare the salad: In a large salad bowl, combine the mixed greens, diced cucumber, diced tomatoes, and sliced red onion. Toss to combine.
Make the tahini dressing: In a small bowl, whisk together tahini, lemon juice, minced garlic, and water until smooth and creamy. Season with salt and pepper to taste.
Assemble the salad: Arrange the falafel on top of the salad greens and vegetables. Sprinkle with optional toppings such as crumbled feta cheese, sliced olives, diced avocado, or toasted nuts or seeds.
Drizzle the tahini dressing over the salad or serve it on the side.
Toss gently to coat everything in the dressing, then divide the falafel salad among four plates.
Serve immediately and enjoy your delicious homemade falafel salad!