Cheese Omelet

To make the cheese sauce, melt the butter, add the flour and mustard powder

Cook over low heat until the mixture is smooth

Remove from heat, add milk, and bring to a simmer while stirring constantly

Cook for 1 minute, then add the grated cheese and stir until melted

Add paprika

Keep warm until serving time

To make the omelet, beat the eggs and white pepper in a small bowl until thickened and pale yellow

In a separate bowl, beat the egg whites with water and salt until stiff peaks form

Fold the egg yolks into the egg whites

Melt butter in a skillet over low heat

Add the egg mixture and cook slowly, stirring occasionally, until the eggs are set and golden brown (about 5 minutes)

Place under moderate oven heat for 12-15 minutes or until clean when tested with a knife

To serve, slide the omelet onto a plate, draw a line in the center with a spatula, place tomato slices on half of it, cover with the cheese sauce, and fold the other half over.