Here's an exceptionally easy condiment, perfect for a summer barbecue. Not only great on burgers, it's terrific as a glaze on grilled salmon or served alongside barbecued chicken.
Make Ahead Tip: Cover and refrigerate for up to 2 weeks or freeze for up to 1 month.
To oil a grill rack, oil a folded paper towel, hold it with tongs and rub it over the rack. (Do not use cooking spray on a hot grill.)