One of our favorite ways of preserving our home-grown vegetables is by steaming and freezing quart bags of mixed veggies. Generally, these will have zucchini, carrot, pepper, and the occasional onion.
One way to cook these mixed veggies is to saute them immediately after taking them out of the freezer. For the first fifteen to twenty minutes the vegetables will release their water which we pour off in the sink. Once the water is gone, we add olive oil, salt, pepper, and spices and saute until done.