It seems cruel that lemons are in season in winter when lemon flavors taste so good in summer. But you can stretch the lemon season with your freezer.
Freezing lemon or lime juice is easy. The most convenient way is in ice cube trays, so you can freeze 1 to 2 tablespoons of juice at a time. The water may separate and rise to the top, so a small amount lets you thaw it and stir it back together before using. After freezing, pop out the cubes and put them in a resealable freezer bag.
The rind will lose some of the flavor of volatile oils, but not all of it. You can grate it on wax paper, then fold it up and freeze it, or you can put it in ice cube trays and cover with a little water.
Even better: Add grated zest to the ice cube trays when you freeze the juice. You’ll get even more flavor that way.
— Kathleen Purvis