1 tablespoon olive oil divided 1 pound boneless sirloin steak cut into ¼-inch thick slices 2 garlic cloves minced 1 tablespoon minced fresh ginger 5 ounces thinly sliced shiitake mushrooms 4 tablespoons coconut aminos or low-sodium soy sauce 1 tablespoon fish sauce 4 cups beef broth ½ teaspoon kosher salt ½ teaspoon black pepper 1…