Salting eggplant before cooking draws out moisture, concentrating its flavor and improving its texture by preventing it from becoming soggy and absorbing too much oil.
Eggplant contains a lot of water and compounds that can contribute to a slightly bitter taste. Salting the eggplant utilizes osmosis. When salt is applied to the eggplant, it creates a hypertonic environment outside the eggplant cells. This means there's a higher concentration of salt outside the cells than inside. To equalize the concentration, water from inside the eggplant cells is drawn out.
This process achieves several things:
To salt eggplant effectively, slice it to your desired thickness, sprinkle it generously with salt (kosher salt is a good choice), and let it sit for at least 30 minutes, or up to an hour. You'll notice beads of moisture forming on the surface. Before cooking, rinse the eggplant thoroughly to remove the excess salt and pat it dry with paper towels.
Don't skip rinsing the eggplant after salting! Leaving the salt on will make your dish overly salty. Also, patting the eggplant dry after rinsing is crucial for achieving proper browning during cooking.