I’m also a vegetarian. And if it could be verified that they are not actually creating animals, just chemical compounds that are similar or even exactly like animal flesh (even if the original cells that started this type of product came from animals, as long as it didn’t involve harming animals in any way, or killing them) that would probably be OK.
Also, I’d want to be assured that the product didn’t have anything different about it that would be more likely to cause cancer or heart disease or other unknown problems. I’d probably be OK with this type of product, even if the original cells came from humans. I would just have to be assured that the products are completely non-sentient, just cells (or whatever you would call something like that, like how a mushroom is not sentient, only made from meat cells instead of plant cells).
I think this technology would be better suited for creating new organs for humans (without having to kill another human or an animal, or having to wait for a donation from a person who has died, or making the risky decision to take a donated organ from a living donor) rather than for food, but if they can do both, then that would be good.