Grapefruit cordial Preparing cordial is very simple: It is necessary to prepare fresh grapefruit juice (if you have a juicer, use it or, as in the video, use a blender). Next, mix it in a saucepan with sugar (sugar is half of the volume of juice, in my case, 400 ml of juice and 200 g of sugar), add zest at the rate of 5% of the total volume. Stir all the sugar over medium heat and turn off the heat. It remains to filter the mixture, add 0.8% ascorbic acid to 100 ml of cordial, stir until dissolv