Pineapple-Ginger Marmalade

I make this marmalade in the dead of winter whenever my collection of confitures is running low, since, happily, good pineapple is always available. One pineapple yields a lot of jam—another thing to be happy about. The best way to judge if a pineapple is truly ripe is to take a whiff. If the fruit is ripe, it will smell strong and sweet and the flesh will be sweet, too. Using the old wives’ tale method of plucking a leaf from the top just means you’re going to get strange looks from the people in the produce department. And if you do it in France, where I live, you might even be reprimanded.