The original recipe is linked above. I made a few substitutions, which are listed below.
Ingredients: (this makes one sandwich, multiply as needed)
2 slices ciabatta
Dijon mustard, for spreading
thin slices of Gruyère cheese
2 oz thinly sliced smoked salmon
Finely grated zest of 1/4 of a lemon
Freshly ground pepper
Spread 1 slice of ciabatta bread with some Dijon mustard, as little or as much as you’d like. Top with some Gruyere cheese.
Top with smoked salmon and lemon zest.
Season lightly with salt and pepper and cover with more Gruyere cheese. Top with other piece of bread.
Grill for 2 to 3 minutes until toasted and the cheese is melted.