Warm Beef and Cheddar Sandwiches With Horseradish Sauce Recipe

Name: Warm Beef and Cheddar Sandwiches With Horseradish Sauce Recipe
Ingredients: For the Cheddar Cheese Sauce:; 8 ounces extra sharp cheddar cheese, grated; 1 tablespoon cornstarch; 1 (12-ounce) can evaporated milk; 2 teaspoons Frank's Red Hot or other hot sauce; For the Roast Beef and Buns:; 1 pound thinly sliced roast beef; 4 pretzel buns or other rolls, split; For the Horseradish Sauce:; 1/2 cup sour cream; 1/2 cup prepared horseradish; 2 tablespoons minced chives; 1 tablespoon freshly squeezed lemon juice from 1 lemon; Kosher salt and freshly ground black pepper