Summer citrus all year

If you have citrus fruits that you know you won't be able to make use of before it's past its prime, here is a way to very easily preserve them indefinitely.
I personally love little jars, so that is what I started with. You can use other containers, but just make sure you can leave off the top/lid/cork. Start by zesting each type of fruit. At the moment I have 1 grapefruit, 2 oranges, and four limes. I zest each type separately, but if you wanted to blend them you certainly could. The zest goes into one of my little jars, cork off, with a little salt. I leave them in an open window to dry as much as possible, and the salt helps keep any mold from starting. Once they are completely dried, cork and keep in a cupboard. Now that you have zestless fruits, you can juice them and freeze the juice, or I prefer to freeze the naked fruit in a freezer bag whole. You can then defrost and juice, or even slice a bit off when frozen and toss it down your kitchen drain to make your sink disposal smell amazing. They are also great for margaritas or sangria, because the citrus will break down as it thaws, releasing much more flavor and juice than a fresh citrus. The zest you can use just like fresh in any recipe; just rinse in a little cold water to remove any salt.