Finely grate the cheese. Drain the cucumbers briefly. Spread the toast thinly with 1 teaspoon of mustard on each. Cover 4 slices of toast evenly with cheese, ham, gherkins and chips. Place 1 blank slice of bread on each slice and press the sandwich lightly together.
Heat 1 tablespoon of butter in a coated frying pan. Fry 2 sandwich loaves in it over medium heat for 1-2 minutes on each side until golden brown, turning them gently with a spatula and fork.
Remove and keep warm.
Fry the rest of the sandwich breads in the remaining butter as well. Cut all sandwiches in half and snack hot or cold. Crunch, crunch!.