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Cooking often breaks down the heat-sensitive proteins that trigger oral allergy syndrome, so the cooked yellow onion in this recipe is likely tolerated by many with OAS. If unsure, consult your doctor. To always avoid yellow onion, tap it and change its rating to Red.








Preheat the oven to 400°F (205°C). Arrange the onion halves cut-side up in a 9×13-inch baking dish.
Drizzle the 2 tbsp olive oil over the onions and sprinkle with salt. Turn each half cut-side down in the dish.
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