It is hard to grow any eggplant here that does not get friction rubs or mites. the white eggplant often has brown scratches mostly from rubbing. I did grow Easter egg. It is an ornamental and the fruit is small but edible but usually does not rub on anything, so as long as the bug damage is minimized it will stay white. or creamy yellow.
White eggplants are less bitter and have creamy flesh. I do peel them first since they are a harder fruit than the green or purple eggplant.
What about the white tomatoes Apple, what varieties are you planting for your white garden?
You could also do parsnip or burdock (gobo). Gobo can get over 3 ft long. It is easy to grow but very difficult to harvest. The easiest way to plant it is to get a 55 gallon drum take off the top, and split it in half longitudinally. Tie or wire the barrel back together. make holes about 2 inches from the bottom of the barrel for drainage. fill the barrel with potting soil and plant the seeds on top. Alternatively, you can get 4 inch pvc pipe about 4 ft long and split it in half. Tie it together again and put about 1 foot in the ground and stake it. Fill the pipe and plant one seed on top. By the time the gobo is to be harvested it should be near the end of the pipe and the root will be straight.
Did anyone mention mushrooms yet?