Sugared berries will keep for a year or longer under refrigeration. You can prepare strawberries or blackberries the same way but raspberries seem to do and taste best.
2. Put the berries in a mixing bowl, and pour the sugar over them.
3. Use two large forks or a potato masher to mash the sugar into the raspberries until they are liquefied and there is no trace of whole berries left. (A blender is not good for this, because it will pulverize some of the raspberry seeds, which should remain intact.)
4. Transfer to jars and refrigerate for 2 days before using. Sugared raspberries will keep for 1 year or longer under refrigeration.
Andrea Reusing is the creator of the restaurant Lantern in Chapel Hill, N.C., and author of the book Cooking in the Moment: A Year of Seasonal Recipes. In this installment of The Key 3, she shares with Lynne Rossetto Kasper the techniques behind three of her favorite recipes: Turnip Soup, Overnight Braised Short Ribs and Tomato Salad.