Put the butter and plain and corn flour into the blender.
When it resembles bread crumbs, add in the rest of the ingredients, blend till it becomes a dough, not more than 1 minutes.
Divide both the dough and the pineapple tarts into 60 portions.
Wrap each pineapple portion with the pastry filling.
Egg wash with egg yolk twice, allowing the first layer to dry before applying the next.
Bake at 180C for 15 minutes. Not over.