After rituals, Wiccans in my denomination usually say a food blessing before the feast. The version I use when Z says it's my turn to say grace is actually adapted from the blessing of the wine and cakes from the middle of the ritual liturgy, though, because it's nice and short. It's sort of morphed into, "For the gifts of love and laughter, family and abundance, we give thanks." I figure, each person at the table can thank Whoever seems appropriate.