[bingo-bongo]

Do you know if it says anything about restarting them simultaneously or not?

I would think trying to restart engines one at a time would be preferred, over both of them at the same time - or maybe thats not how it works..?

[benlivengood]

Just from a systems perspective if the actions to restart the engines can be parallelized then they should be; maybe only one engine will start. You don't want the 50% (for 2-engine aircraft) chance that you spend time on the one that won't start before trying the other.