Cod Cakes

Name: Cod Cakes
Ingredients: Salt; Bay leaves, for boiling cod; Black peppercorns, for boiling cod; Lemon wedges, for boiling cod; 5 pounds cod fillets; 3 pounds Yukon golden potatoes, peeled and quartered; 2 Spanish onions, diced; Canola oil, for pan-frying; 4 cups (2 pints) sour cream; 1 cup diced fresh chives; 1 cup Dijon mustard; 1 cup chopped scallions; 1/2 cup Worcestershire sauce; 3 tablespoons Old Bay seasoning; 1 tablespoon garlic powder; 1 tablespoon white pepper; 1 pound panko breadcrumbs; Melted butter, for pan-frying