Easy Salmon Cakes

Name: Easy Salmon Cakes
Ingredients: 2 teaspoons extra-virgin olive oil plus 2 tablespoons, divided; 1/2 cup finely chopped onion; 3 tablespoons finely diced celery; 2 tablespoons chopped fresh parsley; 2 (6-ounce) cans unsalted boneless, skinless salmon , drained; 1 large egg , lightly beaten; 1 1/2 teaspoons Dijon mustard; 1/2 cup panko breadcrumbs, preferably whole-wheat; 1/2 teaspoon ground pepper; 1 lemon , cut into wedges for serving (optional); Creamy Dill Sauce for serving (optional)