French · France
Crispy Croque Monsieur with Sourdough Fermentation
A variation using extended sourdough fermentation for a more complex flavor and crispier texture when grilled.
10 minutes1 servings

Ingredients
Method
- Prepare sourdough bread by fermenting it for 24 hours in the refrigerator.
- Preheat a skillet over medium heat and add butter.
- Spread mustard on one bread slice, then layer ham and cheese.
- Top with the second bread slice and spread mayonnaise on the outside.
- Cook for 3-4 minutes per side until golden and cheese is melted.