While roasting the semolina, ensure it is not burnt. You need to stir continuously in medium flame.
If you prefer you can peel off the apple but let cubes be small in size.
It's the ghee that makes apple kesari non-sticky and also texture heavily depends upon ghee itself. So reserve enough ghee for this recipe.
If you add little less ghee, it doesn't harm the taste but the kesari becomes thick and solid.
If you have a sweet tooth then you can increase amount of sugar to even 1 cup, in that case apple kesari gets glowing luscious look too.
You can add food color also replacing saffron.
Add sugar only after the semolina gets cooked in water, otherwise it will harm the texture and taste.