
Roasting onions low and slow transforms them into something almost unrecognizable — deeply golden, tender all the way through, and rich with savory sweetness that makes them feel far more indulgent than the short ingredient list suggests. A drizzle of olive oil spiked with thinly sliced garlic and turmeric pools between the layers as they roast, infusing every bite with warmth and color. Fresh rosemary tucked alongside each half perfumes the whole pan, and a final splash of apple cider vinegar at the end cuts through the richness just enough to make everything sing. This kind of dish can be tricky to pull off on a strict elimination protocol because so many roasted vegetable recipes sneak in nightshade-based spices or seed oils — but every single ingredient here clears that bar cleanly. The two-stage roasting method — covered first, then uncovered — is what makes the difference between mushy and magnificently caramelized. Serves four as a side, and the pan juices are absolutely worth spooning over the top before you bring it to the table.
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Preheat the oven to 400°F (205°C). Arrange the onion halves cut-side up in a large baking dish or rimmed sheet pan, keeping them snug but not overlapping.
In a small bowl, stir together the olive oil, sliced garlic, salt, and turmeric. Spoon the mixture evenly over the cut faces of the onions, letting it pool slightly between the layers.
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