Steak Sandwich with Onion Rings and Cheese Sauce

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Steak:

One 6-ounce strip steak

1 teaspoon garlic powder 

1 teaspoon salt 

Onion Rings:

Canola oil, for frying

2 large onions, cut into 3/4-inch-thick rings 

2 cups buttermilk

2 cups all-purpose flour 

1 teaspoon salt 

Pinch cayenne 

Mustard Cheese Sauce:

1 stick (8 tablespoons) butter

1/2 cup all-purpose flour 

1 quart whole milk, cold 

12 ounces fontina cheese, grated 

2 shots Tabasco sauce 

1 1/2 tablespoons Dijon mustard 

1 1/2 tablespoons whole-grain mustard 

Toppings:

1 seeded semolina roll, cut in half

8 ounces fontina cheese, sliced 

Jarred sliced banana peppers 

Handful of arugula