Some interesting food folklore: In his desperation to stay at the gambling table and assuage his hunger at the same time, Englishman John Montagu, the fourth Earl of Sandwich, asked his manservant to bring him two pieces of bread with some meat in between, thereby inventing — need we say more?
8 5×4-inch slices country-style white bread (about 1/2 inch thick)
8 ounces sharp cheddar cheese, grated (about 2 cups packed)
4 tablespoons (1/2 stick butter)
Mix mayonnaise, chives and Dijon mustard in small bowl. Season with generous amount of pepper. Spread 1 side of each bread slice with mayonnaise mixture. Divide cheddar cheese among 4 bread slices, then top with remaining bread, mayonnaise side down.
Preheat oven to 250°F. Melt 2 tablespoons butter in griddle or heavy large skillet over medium heat. Add 2 sandwiches; turn to coat with butter. Cook until golden on each side and cheese melts, about 5 minutes per side. Transfer to baking sheet. Keep warm in oven. Repeat with remaining 2 tablespoons butter and remaining sandwiches.