I am making a dish that involves roasted vegetables and couscous. I have often found, though, that the zucchini and eggplant are unpalatably watery after roasting them. I have read that if you salt and/or press zucchini and eggplant, you can reduce the amount of water left in them and give them a better texture when cooked. What is the best procedure to rid the zucchini and eggplant of their water before roasting them?
I sliced the zucchini and eggplant and placed them on a baking sheet, filling one layer of a large sheet. I salted them with about 1/4 cup kosher salt. Then I placed a cutting board that just fit inside the edges over the sheet and put my stand mixer on top. I let it sit for 20 minutes, then wiped off all the salt and water that had drained out. This resulted in a much better product.
However, I don't really know if I used a good amount of salt (too much? too little?) and if I left them to drain for a good length of time (too long? too short?) to get the best results. It worked pretty well—not too salty, veggie texture nice and chewy—but could I get even better results by using a more precise procedure?