do you have access to the syns calculator? I would put the nutritional information into the calculator selecting your free food as apple or has it got not nutritional information whatsoever on it?(so long as first ingredient listed is an apple, if it is more chocolate than apple and chocolate is listed first, then I would say it wont qualify for a free food allowance and will be 1 syn for every 20 calories).
If there is no nutritional information at all, you will have to guesstimate by the amount of chocolate on it. For instance 28g of chocolate (generic) is approx 7.5 syns.
Also people do check the syns forum regularly, you just have to be patient. It just makes more work for the mods if you post in the wrong section.