Roast Beef & Provolone Panini Recipe | Land O’Lakes

Ingredients

• 1/4 cup light mayonnaise
• 1 tablespoon prepared horseradish
• 2 tablespoons Land O Lakes® Butter
• 1 cup thinly sliced onion rings
• 1 (8-ounce) package sliced mushrooms
• 1 (10-inch) round focaccia bread, sliced in half lengthwise
• 1/2 pound deli thinly sliced roast beef
• 4 (3/4-ounce) slices Land O Lakes® Provolone Cheese
• 6 thin green and/or red bell pepper rings