Method
heat oil in a large dutch oven over medium heat and cook onions covered, stirring occasionally until translucent, about 15-20 minutes.
Add stock, vinegar, and sugar and cook uncovered, stirring occasionally until onions are caramelized, about 45 minutes.
Season lightly with smoked sea salt and let jam cool, placing it in a pretty jar.
Notes
Perfect addition to a hand-made hamburger, grilled pizza, grilled sausage dogs, stirred into mashed potatoes, etc. and so on…