What is the standard method of applying sauce on a sandwich?

The standard method of applying sauce on a sandwich is typically done in zig zags down the length of the sandwich. This approach allows for even distribution of the sauce throughout the filling rather than concentrating it in one area, which enhances the overall flavor experience and ensures that every bite has the right amount of sauce. The zig zag method also creates a visually appealing pattern, enhancing the aesthetics of the sandwich, which can be particularly important for presentation in a restaurant setting. The way sauce is applied can also help in preventing it from soaking into the bread too quickly, maintaining the desired texture.