To make ahead: The cauliflower can be roasted ahead of time, stored in the refrigerator, and then reheated in the oven before serving (it will soften more as it reheats, so cook it for about 15 minutes less than you’d like earlier on, and let it finish cooking through as it reheats). The tahini sauce can be mixed up ahead of time, and then stored in the refrigerator for a couple days. The herbs can be washed, dried, wrapped up in slightly damp kitchen towels, and stored in a resealable container for several days