Go back to the future with a retro White Castle sensibility — petite hamburgers for the chi-chi crowd, designed to down in a bite or two, pinkies raised. These little wonders can be embellished with blue cheese, roasted tomato, grilled onions, minced and sautéed Portobello mushrooms, hot peppers and the fantabulous “Secret Sauce.” Vary this recipe according to your taste with ground veal, pork or sausage and your own mix of spices and seasonings.