We can rarely get white baby onions where we are, but jarred, pickled miniature onions are easily obtained. These will be drained, soaked in a large bowl of water overnight, and rinsed before being cooked with the chicken and wine etc. I was considering using a solution containing baking soda (Sodium Bicarbonate) to soak the onions in, but I suspect this will cause more problems than it solves.
Will this be sufficient to remove any tartness and trace of acidity? I will probably add a touch of sugar to balance out any bitterness in the wine for good measure. Balsamic vinegar is often added to stews etc, so I am generally happy with the flavour profile, I'm just more concerned that when biting on an onion it will reveal that it was previously pickled.
Will this approach be sufficient to disguise such an outrageous substitution?