FROM THE MANUAL OF INDULGENCES:
26. Prayers of Supplication and Acts of Thanksgiving§1 A plenary indulgence is granted to the faithful who devoutly assist either at the recitation or solemn singing of
1. the Veni Creator, either on the first day of the year to implore divine assistance for the course of the year, or on the solemnity of Pentecost;2. the Te Deum on the final day of the year, to offer thanks to God for gifts received through the course of the entire year.
§2 A partial indulgence is granted to the faithful who,
1. at the beginning and end of the day,2. in starting and completing their work,3. before and after meals,
devoutly offer some legitimately approved prayer of supplication and act of thanksgiving (e.g., Actiones nostras; Adsums; Tibi gratias; Benedic, Domine; Domine, Deus Omnipotens; Exaudi nos; the Te Deum; the Veni Creator; the Veni Sancte Spiritus; Visita, quaesumus, Domine)."Benedic, Domine" is simply the standard Catholic blessing before meals--"Bless us, O Lord, and these thy gifts...""Veni Sancte Spiritus" -- "Come, Holy Spirit, fill the hearts of your faithful and enkindle in them the fire of your love."