A carefully made grilled cheese sandwich is a gustatory wonder. Its key ingredients are bread that’s firm enough to hold its own against heat and pressure but soft enough to produce a tender sandwich; full- flavored, high-quality cheese (my preference is Comté or an aged cheddar), cut about 1/8 inch thick; and clarified butter. The butter flavors the bread and allows it to color deeply without becoming too dark or, worse, burnt. Make the sandwich on a griddle or in a heavy skillet and use another heavy skillet to press it down. The greater the pressure, the more the ingredients will blend and the better your sandwich will be.