For one thing, according to the Burger King website, it has mayonnaise on it. Assuming this is traditional mayonnaise, that means eggs. Obviously, you can ask

For one thing, according to the Burger King website, it has mayonnaise on it. Assuming this is traditional mayonnaise, that means eggs. Obviously, you can ask them to leave that off, but If a food is not vegan in its default configuration, you should probably think carefully about whether they're even trying to achieve vegan compliance.