Visiting Dreamland BBQ (and honestly, just about any BBQ joint) is also on my to-do list, so I can’t vouch for how much of a copycat it is, but I can vouch for how good it is.
Place puree and yellow mustard in a large saucepan and whisk until combined.
Whisk in remaining ingredients and bring to a boil.
Reduce to a simmer and simmer for 30 minutes, stirring often.
Keep in the fridge for 2-3 weeks.
Notes
Note: Dark corn syrup makes for a nice dark syrup with a hint of molasses. For a lighter syrup, use light corn syrup.Note: If you prefer a thicker sauce, combine 1/4 cup corn starch and 1/4 cup cold water and whisk into the sauce as it simmers.