Have you tried grating the fruit or veg, some birds dont like it in great big chunks. Also, what about EMP eggfood given rather 'sloppy'. It does swell and soak up the water so make it really runny. It may take some weeks but if you can get your bird to take a little of this, then you can add grated apple, carrot etc to it. For really fussy birds and especially those which have been handreared, try offering it from a spoon.

For those that give apple and pear etc please remove the pips as they are believed to be toxic tp birds and other small animals.