The first step of cooking the Brussels sprouts can be done in advance. That is what we did the day before Thanksgiving to cut down on some work the day of. You can also mix the sauce together ahead of time and keep it in the fridge overnight but we actually ran out of time Wednesday due to the arrival of family that day. But the sprouts came out AMAZING! We made a little extra sauce for some extra flavor. The only thing I'd do differently next time is quarter the sprouts instead of halve them, especially for the bigger sprouts.