In a small nonreactive saucepan, bring onion, 2 cups water, vinegar, sugar, and salt to a boil over medium-high heat; cook for 1 minute. Remove from heat, and let cool completely. Cover and refrigerate for up to 5 days.
Recipe by Paula Deen Magazine at https://pauladeenmagazine.com/cherry-cola-barbecue-pork-recipe/