Both the jam and pastry have to be done properly. They must compliment each other.
And, having the correct proportion of jam and pastry is of utmost important.

Source: Homemade pineapple rolls (pineapple tarts) | Food-4Tots | Recipes for Toddlers – Part 3

Pineapple Rolls Pineapple Rolls

My version of the pineapple rolls, I like the texture and was very happy with the results. I bought ready made pineapple jam and was too sweet to my taste. I reduced the amount of the jam and it complimented very well with the pastry.