Caramelized pecans make this salad especially good. This is a salad they used to serve at the restaurant one of my son's worked at, Rockbottom Brewery. If you want a salad with a bit more punch, try blue cheese instead of the feta.
Cook 2 to 3 minutes, stirring constantly until mixture is caramelized.
Spread out on wax paper to cool.
In bowl toss together spinach, pecans, apple and cheese.
Add oil and vinegar and toss again until everything is coated.
Chef's note: To make ahead for a special dinner--toss apple with dressing. Layer on greens, cheese and pecans. Cover with plastic wrap and put in refrigerator until needed, tossing just before serving.