Caramelized Onion Steak Sandwich

INGREDIENTS:4 ½ pounds beef tenderloin
4 jumbo Idaho-E.Oregon yellow onions, 1/8-inch slices
12 slices medium cheddar cheese
12 large slices bread
3/4 cup ale mustard
24 lettuce leaves
24 slices tomato
12 oz. unsalted butter, divided
2 ½ tsp. kosher salt
1 tsp. black pepper, fresh ground
2 tsp. fresh minced herbs, such as thyme, rosemary,

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