Lay one piece of salmon skin side down on a small baking dish layered with cling film
Mix salt, pepper and sugar together and sprinkle on top of the salmon together with the dill
Top with second fillet to make a sandwich and wrap tightly in cling film
Place a weighted board on top of the sandwich and marinate at room temperature for 2-4 hours. Then refrigerate for 24-48 hours, turning every 6-12 hours