Chicken Meatballs With Whipped Tahini and Arugula

Name: Chicken Meatballs With Whipped Tahini and Arugula
Ingredients: 1 lb. mushrooms (any variety), sliced into bite-size pieces; 2 Tbsp. extra-virgin olive oil, divided; 2¼ tsp. Diamond Crystal kosher salt, divided; 2 tsp. freshly ground black pepper, divided; 1 large zucchini; 1 small yellow onion; 1 large egg; 2 garlic cloves, finely grated; 1½ lb. ground chicken; ½ cup mint leaves, finely chopped; 2 tsp. sumac; 1 large lemon; 1 garlic clove, finely grated; ½ cup tahini; 1½ tsp. Diamond Crystal kosher salt, divided, plus more as needed; 6 oz. arugula or other greens; ½ cup mint leaves; 1 Tbsp. extra-virgin olive oil; 1 tsp. freshly ground black pepper