I use a variation of the classic recipe - decrease sugar to 2 2/3 cups and add 1/3 cup light corn syrup. When mixture of sugar, corn syrup, margarine, and evaporated milk comes to a boil, scrape the sides well, then cover pan for about a minute to let steam "wash" down sides of pan. Then continue on with the recipe as directed. This allows all the sugar to dissolve, and my fudge never comes out grainy. This recipe is the best!