Per Wowhead tooltips, both the recipe and the feast itself are BoP: Recipe Feast
I guess that in theory, you could contract out to other guild/raids by getting invited in at the start of the raid, drop a feast, and then drop out ... so that at least for the initial pre-wipe and/or 60 minutes that they have the buff. But that seems like a pretty complex transaction when said raid is more likely to just require members to carry individual class-itemized food buffs that give the same +90/+90 benefit.