In the Liturgy of the Eucharist, everything is done as in a Mass with a congregation, with the following exceptions.
After the acclamation at the end of the embolism that follows the Lord’s Prayer, the priest says the prayer Domine Iesu Christe, qui dixisti (Lord Jesus Christ, you said). He then adds, Pax Domini sit semper vobiscum (The peace of the Lord be with you always), and the minister answers, Et cum spiritu tuo (And also with you). The priest gives the sign of peace to the minister, if appropriate.
Then, while he says the Agnus Dei (Lamb of God) with the minister, the priest breaks the host over the paten. After the Agnus Dei, he performs the commingling, saying quietly the Haec commixtio (May this mingling).
After the commingling, the priest quietly says the prayer Domine Iesu Christe, Fili Dei vivi (Lord Jesus Christ, Son of the living God) or Perceptio (Lord Jesus Christ, with faith in your love and mercy). Then he genuflects, takes the host, and, if the minister is to receive Communion, turns to the minister and, holding the host a little above the paten or the chalice, says the Ecce Agnus Dei (This is the Lamb of God), adding with the minister the Domine, non sum dignus (Lord, I am not worthy). Facing the altar, the priest then partakes of the Body of Christ. If, however, the minister does not receive Communion, the priest, after genuflecting, takes the host and, facing the altar, says quietly the Domine, non sum dignus (Lord, I am not worthy) and the Corpus Christi custodiat (May the Body of Christ bring) and then receives the Body of Christ. Then he takes the chalice and says quietly, Sanguis Christi custodiat (May the Blood of Christ bring), and then consumes the Blood of Christ.
Before Communion is given to the minister, the Communion Antiphon is said by the minister or by the priest himself.
The priest purifies the chalice at the credence table or at the altar. If the chalice is purified at the altar, it may be carried to the credence table by the minister or may again be placed on the altar at the side.
After the purification of the chalice, the priest should observe some moments of silence, after which he says the prayer after Communion.