What are the best dipping sauce for Onion rings?

If there is one thing I do love it's onion rings! they are just so good, and taste so lovely. Did you ever eat them before? One thing I wonder about is what are the best dipping sauces for Onion rings? I mean ranch is great, but BBQ sauce also goes well with Onon rings. what do you think are the best dipping sauce for onion rings? please me know in the comments!