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1. Add mayonnaise, crumbled blue cheese, prepared horseradish, and fresh ground black pepper to small bowl. Se aside.
2. Add olive oil to skillet and heat over medium heat. Sauté onion until tender.
3. Spread mayonnaise mixture on one side of each slice of bread.
4. On four slices, layer one piece of cheese, roast beef, sautéed onion, and additional piece of cheese.
5. Top with 4 slices, mayonnaise side down.
6. Spread butter over both sides of sandwiches.
7. Preheat grill pan. Cook 2-3 minutes or until bread is browned and cheese is melted.
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