Lamb Kebabs with Arugula and Tahini

Name: Lamb Kebabs with Arugula and Tahini
Ingredients: 1/2 pound ground lamb; 1/4 cup whole milk; 2 slices white bread, crusts removed, cut into cubes; 1/2 small white onion, diced; 1 1/2 teaspoons smoked paprika; 1 1/2 teaspoons ground cumin; 1 tablespoon powdered milk; 1/8 teaspoon baking soda; 1/2 teaspoon kosher salt; 1/2 teaspoon black pepper; 1 cup all-purpose flour; 2 tablespoons extra-virgin olive oil; 1/2 cup tahini; Juice of 1 lemon, divided; 1 teaspoon salt; 1/2 cup arugula; 1 tablespoon extra-virgin olive oil; flaky sea salt, preferably Maldon