Heat a Dutch oven or large heavy bottomed pot over med/high heat. Add the bacon to the pan and cooked, flipping once, until golden brown, about 10 mins. Remove to a paper towel-lined plate to drain.
Stir in the brown sugar, then deglaze with the vinegar. Mix in the stock and bring to a boil. Reduce to a very low simmer and stir in the greens and seasonings.