Wilting spinach is any kind of process that heats the spinach just enough for it to start to shrink and tenderize, but doesn’t heat it long enough to completely break it down. This can be done by a variety of methods. For our purposes, we are using warm bacon dressing poured over raw spinach. The hot dressing heats the leaves just enough to turn them bright green, and tenderizes them slightly making them sweeter and more pleasant to eat.