&gt;Sandberg: Mark said, ‘I’m going to make a marshmallow,’ &quot; she tells me in her conference room, which is adorned with a framed drawing of her as Spider-Woman. &quot;I looked at my friend and said, ‘He’s going to make the perfect marshmallow.’ Because he’s going to be the one out of all of us who is going to have the patience. In order to make the right marshmallow, you can’t do it right in the fire, because then it gets burnt. You can’t walk away. You actually have to sit there for five to 10 minutes with the marshmallow above the flame, but not too close, so that it gets completely heated but doesn’t burn. And the only person who’s actually willing to do that is Mark. Because he is that focused and that determined. I’ve never met anyone with more perseverance than Mark Zuckerberg.<p>Coming soon to a VC interview: The s&#x27;mores test. Burn it and you&#x27;re toast.