Salt Cod Fritters with Curry Aioli

Name: Salt Cod Fritters with Curry Aioli
Ingredients: 2 tablespoons vegetable oil; 3 scallions, white and light green parts only, minced; 1 ( 2-inch) piece fresh ginger, peeled and minced; 1 garlic clove, minced; Kosher salt; Black pepper; 1 tablespoon West Indian curry powder (see Note); 1 cup mayonnaise; 1/3 cup minced cilantro; 3/4 pound skinless, boneless center-cut salt cod fillet; 1 tablespoon unsalted butter; 1/2 cup minced onion; 1/4 cup minced green bell pepper; 1/4 cup minced red bell pepper; 1 teaspoon freshly ground black pepper; 1 3/4 cups all-purpose flour; 1/4 cup cornstarch; 2 teaspoons kosher salt, plus more for seasoning; 2 teaspoons sugar; 1 1/2 teaspoons baking powder; 1 large egg, beaten; 1 1/4 cups ice-cold sparkling water; Vegetable oil, for frying; L ime wedges, for serving