Pretty sure the sugar is necessary for preserving. You could make it without sugar, but it would just be pulpy juice-water (the sugar is also a thickening agent), and you would have to eat/drink it pretty fast because it will go bad quickly (I would guess a couple days)
In a sterilized and sealed jar, jam made without sugar can last for years. Once you actually open the jar, you have about 7 days to eat it, and you better keep it refrigerated. You don’t need the sugar for thickening—the pectin in the fruit thickens jam just fine.
However, if you don’t add any sweetener, the result will be very sour.
Source: been making my own jam for years, had plenty of time to experiment.
Pretty sure the sugar is necessary for preserving. You could make it without sugar, but it would just be pulpy juice-water (the sugar is also a thickening agent), and you would have to eat/drink it pretty fast because it will go bad quickly (I would guess a couple days)
In a sterilized and sealed jar, jam made without sugar can last for years. Once you actually open the jar, you have about 7 days to eat it, and you better keep it refrigerated. You don’t need the sugar for thickening—the pectin in the fruit thickens jam just fine.
However, if you don’t add any sweetener, the result will be very sour.
Source: been making my own jam for years, had plenty of time to experiment.
So did you actually make jam without sugar and then stored it for years before eating it?
Yes.