01 -
Warm a large non-stick skillet over medium heat to ensure even toasting.
02 -
Spread approximately 1 tablespoon of softened butter on one side of each bread slice.
03 -
Place a slice of bread butter-side down onto the hot skillet.
04 -
Optionally, apply a thin layer of Dijon mustard to the unbuttered side. Arrange several slices of roast beef and top with two slices of sharp cheddar cheese.
05 -
Cover with a second slice of bread, keeping the buttered side exposed on top.
06 -
Grill for 3–5 minutes, pressing gently, until the underside is golden brown and cheese begins to melt.
07 -
Using a spatula, carefully turn the sandwich over and cook for an additional 3–5 minutes, ensuring both sides are crisp and the cheese is thoroughly melted.
08 -
Transfer the sandwich onto a board, allow to cool briefly, then slice according to preference. Garnish with fresh arugula or spinach, if desired.