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gluten free buns
Heat 2 tbsp olive oil in a large skillet over medium-low heat. Add the sliced onions and 1/4 tsp salt, stirring to coat. Cook, stirring every 5 minutes, until the onions are deeply golden, jammy, and reduced to about one-quarter of their original volume, 35–40 minutes. Watch the heat — if the onions begin to brown too quickly or stick, lower the heat and add a splash of water.
Add the apple cider vinegar to the caramelized onions and stir to combine, scraping up any browned bits from the pan. Cook for 1 minute until the vinegar is absorbed, then transfer the onions to a bowl and set aside. Wipe the skillet clean.
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