Ingredients

• 40g Butter, softened
• 1 Tbsp Plain Flour
• 1/2 Cup Milk
• 1/3 Cup Gruyère or Swiss Cheese, coarsely grated
• 1/3 Cup Vintage Cheddar, coarsely grated
• 4 Slices Sourdough, thick
• 1 tsp Dijon Mustard
• 150g Shaved Ham

Method

1. In a saucepan over medium heat, melt half of the butter.  Add the flour and cook, stirring, for 1 minute or until the mixture becomes slightly grainy.  Remove the saucepan from the heat and add the milk.
   
   
2. Whisk the mixture until well combined, then return the saucepan to the heat.  Continue stirring for 2 minutes or until the sauce boils and thickens.  Remove from the heat.  Add half of the gruyère or Swiss cheese and half of the cheddar.  Stir until the cheese melts and mixture is well combined.  Season with salt and pepper to taste.
   
   
3. Preheat a grill or pan over medium heat.  Brush the bread evenly with the remaining butter.  Cook the bread on the grill or pan for 1 minute or until it is lightly toasted underneath.  Transfer the toasted bread slices, toasted side up, to a clean work surface.
   
   
4. Spread mustard onto half of the bread slices.  Spread the cheese sauce on top of the mustard.  Layer with ham slices.  Sprinkle the remaining gruyère or Swiss cheese and cheddar on top of the ham.  Place the remaining bread slices on top, toasted side down.
   
   
5. Cook the sandwiches on the grill or pan for 2-3 minutes on each side or until the bread turns golden brown and the filling is heated through.  Cut the sandwiches in half and serve immediately.