Steak Frites with Black Garlic Butter

Name: Steak Frites with Black Garlic Butter
Ingredients: 1 head black garlic (see Note), peeled; 1/4 cup unsalted butter, softened; 1 teaspoon brandy; 2 1/4 teaspoons kosher salt, divided, plus more for sprinkling; 2 pounds russet potatoes, spiralized into 1/4-inch-thick strands; 1 tablespoon peanut or grapeseed oil, plus more for frying; 1 1/2 pounds trimmed Charolais hanger steaks or other grass-fed hanger steaks (2 to 3 steaks); 1 teaspoon cracked black pepper; Finely chopped fresh flat-leaf parsley, for garnish (optional)