Chapter 35: Weekly servers in the kitchen and at table (paragraphs 1-2)

None should be exonerated from kitchen duty except in case of sickness or the call of some important business for the monastery, because serving each other in this way has the great merit of fostering charity. (From para. 1 of Ch. 35 of Saint Benedict's Rule, trans. by Patrick Barry, OSB, 1997). 

I think it's not just the act of kitchen help, but the illuminating desire to be of selfless service that makes small jobs opportunities for great love.