You can freeze pretty much any citrus juice as is and use the normal containers for freezing: plastic, glass (taking care not to overfill), ziplocks, etc. Many bakers will freeze lemon juice in small portions for convenience.
I don't think that defrosted citrus juices are as appealing as the freshly squeezed ones, but the defrosted lemon juice works in a pinch, especially if it is to be cooked further.
Note that frozen citrus juice has been around for quite a while. FCOJ (Frozen Concentrated Orange Juice) was developed in 1945 and quickly became the most popular form of orange juice until 1985 when it was overtaken by reconstituted and not-from-concentrate juices. Prior to 1945, pretty much all citrus juices were freshly squeezed. FCOJ has traded for decades on the commodities market, including FCOJ futures at ICE (Intercontinental Exchange). You can still go to the supermarket and find frozen concentrated citrus juices. Many recipes up through the Eighties called for cans of the frozen concentrated products.
Household refrigerators and freezers don't attain the same temperatures as the commercial ones and consumers typically don't have the equipment necessary to make high-quality citrus juice concentrate, so I suggest you freeze as little as possible and try to enjoy your grapefruit juice fresh.
Personally, I find that even freshly squeezed grapefruit juice loses much of its appeal very quickly (faster than orange and lemon), so I only squeeze what will be immediately consumed.
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I don't think that defrosted citrus juices are as appealing as the freshly squeezed ones, but the defrosted lemon juice works in a pinch, especially if it is to be cooked further.
Note that frozen citrus juice has been around for quite a while. FCOJ (Frozen Concentrated Orange Juice) was developed in 1945 and quickly became the most popular form of orange juice until 1985 when it was overtaken by reconstituted and not-from-concentrate juices. Prior to 1945, pretty much all citrus juices were freshly squeezed. FCOJ has traded for decades on the commodities market, including FCOJ futures at ICE (Intercontinental Exchange). You can still go to the supermarket and find frozen concentrated citrus juices. Many recipes up through the Eighties called for cans of the frozen concentrated products.
Household refrigerators and freezers don't attain the same temperatures as the commercial ones and consumers typically don't have the equipment necessary to make high-quality citrus juice concentrate, so I suggest you freeze as little as possible and try to enjoy your grapefruit juice fresh.
Personally, I find that even freshly squeezed grapefruit juice loses much of its appeal very quickly (faster than orange and lemon), so I only squeeze what will be immediately consumed.
Best of luck.