What is the average fruit content in jam? I've just looked at the jam i have+it says high fruit content but when i looked only 50% was fruit. This doesn't seem very high!
50 50 fruit to sugar seems to be about as high as you can go and still get a setting jam as opposed to a syrup with lumps of fruit in. Juicy fruits like strawberries can start off at 4lbs fruit to 3 lbs sugar, but you lose a lot of the weight of fruit as steam
PS if you look at the "ahem" budget type of jam, you will fing that the proportion is considerably less!! I have just checked my favourite raspberry jam, Tiptree "tiny tip" which is quite expensive and like eating solid mooshed up respberries and that is prepared with 57 g of fruit per 100g of jam but this reduces to 43g of fruit per 100g of finished product because of the water content of the fruit