Preparing cut vegetables for the next day? To speed up lunch cooking, I'm considering pre-cutting some veggies the day before.

I often do quick meals with zucchini and eggplant and both do seem to be not too well suited for cutting and then storing them in the fridge for like 18 hours. (If I cut them the evening before.)

Are there any tricks for "pre-preparing" these?
I find that a small amount of acid helps prevent the ugly browning and "sliminess" that may occur, however many foods like eggplant, okra, etc. that rely mostly on their moisture for structure, tend to be the poorest performers. I've had more luck cooking certain vegetables like this in advance then refrigerating, than I have trying to prep in advance.