Fried Calamari with Fried Lemons and Lemon Aioli

Name: Fried Calamari with Fried Lemons and Lemon Aioli
Ingredients: 1 pound calamari, bodies sliced into 1/2-inch rings and tentacles cut in half; 1 1/2 cups buttermilk; 1/2 cup mayonnaise; 2 teaspoons Dijon mustard; Zest and juice of 1 lemon; Kosher salt and freshly ground black pepper; Neutral cooking oil, for frying; 1 1/2 cups all-purpose flour; 3 teaspoons paprika; 2 teaspoons kosher salt; 1 teaspoon freshly ground black pepper; 2 lemons, sliced thin (about 15 slices), plus lemon zest for garnish; 1 cup fresh parsley leaves, plus some chopped, for garnish