Ingredients

The following ingredients have 4 Servings
  • 3 Tbsp unsalted butter, divded
  • 1 medium onion, (thinly sliced)
  • 1 Tbsp brown sugar
  • 1/4 tsp salt
  • 1/4 tsp pepper
  • 4 slices rye bread
  • 3 Tbsp grainy mustard
  • 4 slices provolone or Swiss cheese
  • 4 slices leftover corned beef

Instruction

  • Add 1 Tbsp butter to a large skillet over medium low heat. When melted, add onions and stir until well coated in butter.
  • When onions are turning transparent, after about 10 minutes of cooking, stir in brown sugar. Continue cooking for 20-40 minutes, stirring every 5 minutes or so, until onions are well caramelized. Stir in salt and pepper.
  • Spread remaining 2 Tbsp butter on one side of all four slices of bread. Spread a thin layer of dijon on the other side of the bread slices. Place two slices of bread bread butter-side-down on skillet over medium-low heat.
  • Place 2 slices cheese on each slice of bread. Top with  corned beef slices and caramelized onions.
  • Top with the other slice of buttered bread. And after cooking a few minutes on one side, carefully flip the sandwich over. Cook until bread is toasted and cheese is melty.