Roast Beef and Cheddar Panini

• 4 slices sourdough bread
• 6 oz deli roast beef, thinly sliced
• 4 slices sharp cheddar cheese
• 1 medium onion, sliced
• 2 tbsp mayonnaise
• 1 tsp prepared horseradish
• 1 tbsp butter

Instructions

1. 1

   Gather and prepare all ingredients as specified in the ingredient list.

2. 2

   In a skillet with a little butter, sauté the onion slices over medium-low heat until caramelized, about 10-15 minutes.

3. 3

   Mix mayonnaise and horseradish in a small bowl.

4. 4

   Spread the horseradish mayo on the inside of the bread slices.

5. 5

   Assemble sandwiches with roast beef, caramelized onions.

6. 6

   Cheddar cheese.

7. 7

   Grill on a panini press or in a skillet until bread is crispy and cheese is melted.