One method to make tabouleh, is to soak bulgur wheat in water. The method is to pur an amount of bulgur into a bowl, cover it with water and have it soak in the fridge for about 30 mins. until the water is absorbed. This softens the bulgur. No squeezing is done.
If I recall correctly, there is a problem with soaking things on Shabbat, and I seem to recall some prohibition against soaking vegetables (or is it only pickling in brine?) on Shabbat. I also am pretty sure that there is a problem soaking your clothes (laundry? cleaning?) but I don't know if there is a problem soaking food in the manner prescribed.
Would there be a problem preparing tabouleh in this manner?