Roast-Beef Cheddar Panini - cooking recipe

Ingredients

1 large onion, sliced
1 teaspoon sugar
1/2 teaspoon salt
1/2 cup prepared creamy horseradish sauce, divided
8 slices whole wheat bread
1 lb deli roast beef, slices
4 slices cheddar cheese (or Swiss cheese, or provolone cheese)
1 tablespoon melted butter

Preparation

Stir/saute the first 3 ingredients in a lightly greased skillet over med-high heat for 8 minutes or until the onion is tender.
Spread 1 T. horseradish sauce on each of 4 bread slices; top evenly with roast beef, cooked onion, and cheese.
Top with remaining bread slices.
Brush melted butter on both sides of sandwich.
Cook in a preheated panini press 2 to 3 minutes or until golden brown.
Serve with remaining horseradish sauce.