
Slow-cooked onions have a kind of kitchen magic to them — three large yellow onions shrink down into a glossy, jammy, deeply golden pile that tastes almost sweet and savory at the same time. The long, patient cook over medium-low heat is what does it, coaxing out natural sugars without any added sweeteners, which makes this recipe a genuinely satisfying option when you're avoiding sugar and processed ingredients. A splash of apple cider vinegar at the end brightens everything up and adds a subtle tang that keeps the flavor complex rather than one-note. Optional fresh thyme leaves round it out with an herby, aromatic finish that feels a little fancy for something so simple. The whole thing comes together with just olive oil, salt, pepper, and pantry staples — no hidden additives, no questionable sauces, nothing that would throw off a careful eating plan. Serve it over grilled chicken, stir it into eggs, or pile it onto a grain bowl for an instant flavor upgrade. This batch serves four and reheats beautifully, so it's worth making a full pan whenever you have the time.
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Heat the olive oil in a large (12-inch) skillet over medium heat until shimmering. Add the sliced onions and salt, and stir to coat evenly in the oil.
Cook the onions, stirring every 3–4 minutes, for 15 minutes, until they have wilted and released most of their moisture and are beginning to turn translucent.
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