Most kids who grew up in the South know this as lunch food, spread between white bread, maybe with a slice of tomato.
You can also stuff celery with it, or just eat it on crackers. Once you're hooked it's hard to stop!
A note on the mayonnaise - It is important to use good mayo here. If you make your own, that's perfect! Otherwise, Duke's is preferred. If you live outside the South & cannot get Duke's, please use Hellman's or Best Foods. If you live outside the States & don't have access to any of these brands, you're on your own! Just use the best quality mayonnaise you can find - NOT "salad dressing"! You can leave out the pecans if you like - they're a bit of an add-in and purists would frown at their addition, but I like the crunch they add. I usually only add them if I'm using the pimento cheese for finger sandwiches or for filling tiny tomatoes for a party,
NOTE - the "servings" listed for this recipe is a pretty arbitrary measure, because it depends on what you're doing with it. Are you making sandwiches, stuffing it in celery, or are you eating it out of the jar with a spoon?
I think this recipe makes 6 to 8 sandwiches, depending on how thick you spread it on.