Big Fat Burger with Gruyere, Ham, Pickled Onions, Arugula, and Garlic Mayo

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Pickled Onions:

1 tablespoon salt

1 teaspoon sugar

1/4 cup red wine vinegar

1/4 cup water

2 shakes hot sauce (recommended: Tabasco)

1/2 small red onion, sliced thin (preferably on mandolin)

Burger Mix:

12 ounces ground beef

1/4 cup ham, cut into 1/4-inch dice

1/4 cup grated Parmigiano-Reggiano

1/4 cup Gruyere, cut into 1/4-inch dice

1 large clove garlic, smashed and finely chopped

Kosher salt

2 slices Gruyere

2 sesame seed buns

1/2 cup mayonnaise mixed with 1/2 teaspoon garlic powder

2 slices beefsteak tomato

1 cup baby arugula, washed