Mix tartar sauce ingredients together and refrigerate until ready to use.
Pour ½ cup panko bread crumbs in a bowl.
Form 6 evenly sized patties and coat each side in the bread crumbs.
Heat butter in a large skillet over medium heat. Fry the crab cakes about 5 minutes each side. Avoid moving them unnecessarily as they are delicate and can fall apart. Transfer cakes to a plate.
Toast buns in the skillet, adding butter if needed.
Place crab cakes on the buns and top with tartar sauce.
Recipe by The Spice Kit Recipes at https://www.thespicekitrecipes.com/maryland-crab-cake-sandwich/