These salmon cakes are a great way to use up leftover cooked salmon. The cakes are made with mashed potatoes, breadcrumbs, and eggs, and are flavored with green onions, parsley, and Old Bay seasoning. They are pan-fried until crispy and golden brown. The lemon dill sauce is made with Greek yogurt, lemon juice, and fresh dill. It's the perfect tangy complement to the rich salmon cakes.