So I served it to my Thai girlfriend after dinner lastnight. First thing she says is, "Is that cheese?" pointing to the grated cheddar on top of the apple pie, with vanilla ice cream on the side. Obviously she found it strange but kept quiet. So I sheepishly had to admit it and while she ate I braced for her verdict. Eventually she nodded her appreciation pointing out the various flavors that went together very well into the mix -- the salty creamy cheese, the sweet ice cream, the sour-sweet pie filling, the nutty crunch of the walnut streusel topping. I love the entire combination myself but couldn't explain why before. Her insight was valuable. I never thought of it this way. And it made so much sense.
Trust the Thais to look for a good balance of different flavors and textures in their food. This explains why Thai food is so good.
'Never eat more than you can lift.' - Miss Piggy