1. Prepare the Mornay Sauce

    • Combine the grated cheeses with the prepared Knorr® Professional Culinary Cream.
    • Stir until the cheese has melted completely and the sauce is smooth.
    • Season to taste with white pepper and nutmeg; stir in butter. Reserve.
  2. Prepare the Sandwich

    • Spread the outside of the bread with Hellmann's® Real Mayonnaise.
    • Spread the inside of the bread with Maille Dijon mustard.
    • Build the sandwich using Black Forest Ham and sliced Gruyere cheese.
    • Griddle until cheese is melted and sandwich is warmed through.
    • Spoon hot prepared Mornay Sauce over the sandwich and serve immediately.