occasionally, until the bottoms are a deep, even golden
brown, about 4 minutes. Remove the sandwiches to your
cutting board with the spatula. Melt the remaining ½
tablespoon butter in the skillet, sprinkle with a bit of salt,
and repeat the toasting procedure with the second side,
until the sandwiches are golden brown on both sides and
the cheese is thoroughly melted, about 4 minutes longer.
Transfer the sandwiches to the cutting board.
If desired, spread the grated cheese evenly over a large
plate. Press the sandwiches into the grated cheese,
turning once and pressing on them until you get an even
coating of cheese on both sides. Return the sandwiches to
the skillet and cook until the grated cheese has melted
and formed a golden brown crust, about 1 minute.
Carefully flip the sandwiches and repeat with the second
side. Transfer to the cutting board.
- Slice the sandwiches in half on the diagonal, and serve
immediately, with mustard and the tomato soup.