This is a pizza where the base is salmon and the topping is whatever flavour you like.
You will need about 75 g ( 3 oz ) of salmon per person.
Place the piece of salmon in the freezer for ½ hour to just firm up.
Take a sharp knife and cut across the salmon, like slicing bread, into 1/8" to ¼" thin slices.
Chill until required.
Place the slices to form a circle on a greased baking sheet, making sure there are no gaps.
Top with sliced tomatoes & mushrooms and grated cheese, or choose your own topping.
Bake at Gas mark 5 / 375oF. / 190oC. for 10 - 15 minutes until the cheese is bubbly and golden brown.