I always loved onions and always will eat them, probably.
I use garlic and lots of other spices too. It’s just amount amounts.
I don’t need much of them anymore. They aren’t only carby but very flavorful and onions are quite sweet as well and I don’t like my savory food too sweet. So I mostly use some onion powder (or rather my BBQ spice, it has onion powder, garlic powder, mustard seed powder, black pepper and more, it’s about every spice I like except red pepper) but a stew must have onions in this household. Still, it’s not extremely much despite my high-carber SO makes it. Onion is a spice for the meat. It’s nothing like my past when I easily used a whole BIG onion per 1-2 eggs in my scrambled eggs… I stopped doing that during my low-carb then keto years and it’s fine, I wrote, onions are very flavorful, a little goes a long way. Sometimes I keep some fried onion in the fridge and use a little for dishes. No need for a whole onion for a single portion. Especially not with 10g net carbs, I overdo that amount with animal products alone very easily (I usually don’t as I try to avoid lactose but it would be ridiculously easy. even 20g would be easy)… But if I stick to meat and eggs, it’s around 5g. If it’s only meat, some onions fit in too. Considering 10g carbs seem to be your hard limit, carnivore (maybe relaxed or dirty or almost carnivore) comes to mind… You can make some special day with more veggies and meat if you like but it’s probably easiest if your default attitude is not eating plants. I couldn’t even do 20g when vegetables were on the menu except like now: spices, condiments, some onion in some meat dishes, even half a pickle sometimes… That works but some veggie dish wish multiple vegetables (even higher-carb like onion) and mushroom?! It’s not a dish for <10g net carbs unless you like tiny portions.
If I don’t need “proper” onions in a food but some kind would be nice (it’s spring when I like fresh new things and my beef soup is a tad boring), I use some spring onion (I keep them in a pot, they grows so quickly! they are pretty cute too), it’s mostly green leaves. It’s nice too just not like mature onion heads but it’s good, it’s green and not sweet… I dislike most green leaves but onions are fine. I do the same with garlic, by the way but garlic green leaves are much more similar to the bulb taste wise.
Onion flavored oil… I have that sometimes, better than nothing but it’s weak, simply using way less onions probably would be similar.