asking the impossible? how do I mimic the flavor of caramelized onions without onions?

I’ve already gone through the five stages of grief in realizing I can no longer digest onions. I’ve mostly lived around it, but as a Polish gal who is currently trying to make pierogis, how do I mimic the depth and flavor of caramelized onions without actually using them? 😭 I can tolerate a minuscule amount of dried onions powder (enough to live through the tummy troubles for a little speck of the flavor lol) but that cannot compare to any help is appreciated 🥲