For sauce: In a small bowl, stir together all ingredients. Cover and refrigerate for up to 5 days.
For onion rings: In a large bowl, whisk together buttermilk, eggs, and hot sauce. Add onions, submerging fully in buttermilk mixture, and let stand for 1 hour.
In a large Dutch oven, pour oil to a depth of 4 inches, and heat over medium heat until a deep-fry thermometer registers 350°. Line a rimmed baking sheet with paper towels, and place a wire rack over pan.
In a medium bowl, whisk together flour and all remaining ingredients. Drain onions, and dredge in flour mixture to coat, shaking off excess.
Fry onions in batches for 2 to 3 minutes or until golden brown. Let drain on wire rack; serve with sauce.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/vidalia-onion-rings-recipe/