Hard boil the eggs (simmer about 10 min). Remove yolks from whites. Chop whites coarsely.
Mix egg yolks, olive oil, celery seed and Dijon mustard to make a dressing for salad.
Heat bacon grease till it just about smokes and add red wine vinegar. Add chopped whites .
Pour over salad, add cut up bacon, toss and serve and serve on a bed of fresh spinach.