Whisk together the apple cider vinegar and the low FODMAP garlic powder in a nonreactive medium size saucepan until the powder is dissolved. Then, whisk in the mustard, honey, brown sugar, chipotle chiles, ketchup and Worcestershire sauce. Bring to a simmer over medium heat, whisking occasionally, and remove from heat; it doesn't really need to be "cooked". Taste and adjust seasoning with black pepper as desired.
Cool and pour into a storage container. Sauce may be refrigerated for up to two weeks.
