I ADORE the taste of onions - I use them to flavour practically everything - back in my low fat days, I would happily add 200-300g of onions into a stew because I thought it was healthy. I would also take a 500 g tub of colesslaw and chop into it 1.5 g of onion, carrot, apple, and cabbage - again in the mistaken belief that would be better for me than the mayonnaise then use a cereal bowl of that as a low calorie snack.
On looking at the " below ground vegetables rules the things that it truly HURT to give up was onions and carrots . So instead I decided I would still use them but in VERY limited quantities as flavourings - I have found to my surprise that a very small quantity still packs an enormous punch in terms of flavour but does not seem to make any difference to my blood sugars . Interesting I think cabbage does react badly - so I am now getting rid of that .
In the end we all have to find the food compromises that make life worth living - which for me was retaining a bit of onion!