
Slow-cooked onion jam is one of those deeply satisfying condiments that makes almost everything it touches taste more special — think cheese boards, grilled meats, roasted vegetables, or a thick slice of crusty bread. This version is built entirely on real, whole ingredients: butter, yellow onions, honey, apple cider vinegar, and fresh thyme. There's no canola, no sunflower oil, no mystery blends — just unsalted butter doing the heavy lifting and coaxing those onions into something silky and deeply caramelized over low, patient heat. That slow cooking process is the real secret, letting the natural sugars in the onions develop into a rich amber color before the honey and vinegar go in to balance everything with a gentle sweet-tart finish. Store-bought versions of this kind of condiment often rely on refined vegetable oils as a base or preservative, so making it yourself gives you full control over what goes into the jar. The thyme adds a subtle herbal note that keeps it from tipping too sweet, and the apple cider vinegar gives it just enough brightness to cut through richer foods. It comes together in a single skillet and keeps in the fridge for a few days — though it rarely lasts that long.
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Melt the butter in a large heavy-bottomed skillet over medium heat until foamy and just beginning to subside.
Add the sliced onions and salt, tossing to coat. Cook over medium heat, stirring every 3–4 minutes, until the onions have fully wilted and turned pale gold, about 20 minutes. If the onions begin to stick or brown unevenly before they have softened, add 1 tbsp of water and scrape up any fond.
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