Not So Old Fashioned Cod Cakes with Lemon Dill Sauce

Name: Not So Old Fashioned Cod Cakes with Lemon Dill Sauce
Ingredients: 1 lb Icelandic Cod Fillets; 2 cups vegetable stock; 3 lbs red potatoes; 2 tablespoons butter; 1 medium onion (diced); 4 cloves garlic (diced); 3 eggs; 2 tablespoons fresh parsley; 2 tablespoons green onions; 3 tablespoons stone ground mustard; 1/2 teaspoon kosher salt; 1 teaspoon black pepper; 2-3 cups Cooking oil - enough for a 1/2 inch in your skillet; 1 cup plain greek yogurt; 4 tablespoons fresh squeezed lemon; 2 tablespoons fresh minced dill