White sauce, also known as béchamel sauce or besciamella, is a simple French sauce made of equal parts butter and flour, milk, and sometimes other seasonings such as nutmeg, salt, and herbs. It’s often used in lasagnas and moussakas and can be cooked with cheese to make mornay sauce.
Make the omelet by cooking egg then putting spinach to one side and, placing the smoked salmon on top of the spinach then add cheese.
Make the white sauce by melting the butter, add flour, stock granules and milk until it thickens.
Serve the omelet with the white sauce and enjoy!