I've seen a couple of questions here, that touch the issue of aubergine bitterness:
But nobody writes about the connection between the taste of a raw and a cooked eggplant. (Do not be afraid to taste a raw eggplant - it's not poisonous, you would have to eat 36 raw eggplants to cause any harm.)
So, if you chew a small bit of a piled eggplant before cooking, and it does not taste bitter, is that a guarantee that it will not taste bitter after cooking?