You can have LOTS of fun with this. I drain the tuna and smash it first, and then add whatever white wine I might be drinking in its place. Next, I add creamy dijon instead of plain mustard. Panko bread crumbs are the best. All of this can be extremely low sodium, too! Mixed with the egg and coated with more panko bread crumbs. Let them sit for a few minutes to "gel" as it were. Once in the pan (I use olive oil and butter) they brown nicely after 3 to 4 minutes. Before I turn them, I sprinkle them with Tabasco sauce. Flip, brown, wonderful!