Ancho Chili Powder will work instead of Chili Powder which has onions. Celery works in some recipes, so does just skipping it. For anything that absolutely needs something garlic/onion-y use ASAFOETIDA POWDER.
Any substitutes for onions? - Page 4
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I confess there was a time I thought the "onion sensitivity" was bogus, but now I know what it means. It wasn't easy to give up cooking with and eating onions but the bloating and all the other tell-tale effects are serious enough to convince me it is necessary.
Like others, I do enjoy spring onions, but only in moderation. Garlic does not seem to create a problem.
My biggest challenge is knowing what to eat at potluck events and when invited out for a meal.
In cooking at home, I'm having reasonable success using finely shredded parsnip to give a little extra zest in place of the onion. If I have extra shredded parsnip, I freeze it. I have also dehydrated it.
I tried cippolinis, but the reaction was the same as with eating onion.
Today I found this:
I will try sautéing onion and using the flavoured oil to enhance the hambone I've got simmering right now for dried bean soup.