Prep and Dehydrate the Aubergines
Arrange the aubergine slices on baking sheets lined with paper towels. Sprinkle evenly with the fine sea salt. Let stand for 30 minutes to sweat out bitter juices. Wipe away the beads of water and salt with a clean towel, press down firmly to flatten their cellular structure, and dry completely.
Aubergines are filled with air pockets and moisture. Salting collapses these pockets, ensuring they bake to a rich, meaty texture rather than turning into a watery mush inside the casserole.
Noticeable drops of moisture pooling on the surface of the flesh and the slices becoming pliable.