The Yorkshire pudding mix can be made two or three days before and kept in the fridge. Be sure to make the baking tray piping hot, says Mr. Ramsay, so that when the cold batter hits, the puddings will puff up. Once ladled into the tray, sprinkle with coarse salt, and then once in the oven, leave the door closed. "Treat it like a soufflé." Try this with a roast and gravy but they are so good that you can have them with anything! I included the minimum amount of resting time in the prep time and the time for the stove to heat up before cooking in the cooking time. Enjoy!