Holy Qurbana

The Holy Qurbana (ܩܘܪܒܢܐ ܩܕܝܫܐ "Qurbānā Qaddišā" in Eastern Syriac or "Qurbānā Qandišā" in the Indian variant of Eastern Syriac, the "Holy Offering" or "Holy Sacrifice" in English), refers to the Eucharist as celebrated in East Syriac Christianity. This includes various descendants of the Church of the East. East Syriac Christianity consists of Edessan liturgical rite, the East Syriac Rite (also known as the Edessan Rite, Assyrian Rite, Babylonian Rite, Chaldean Rite or Persian Rite). The major Anaphora of the East Syriac tradition is the Holy Qurbana of Saints Addai and Mari. The Churches are primarily based in the Middle East, Africa, and India.
The East Syriac Rite is used in the Syro-Malabar Church based in India, the Chaldean Catholic Church based in Iraq, in the Assyrian Church of the East based in Iraq (including its archdiocese the Chaldean Syrian Church of India) and the Ancient Church of the East based in Iraq. The Assyrian Church of the East and the Ancient Church of the East are not a part of communion with the Oriental Orthodox Churches, and they are not a part of the Eastern Catholic churches.
Etymology.
The East Syriac word "Qurbana" is derived from the Aramaic term "Qurbana" (ܩܘܪܒܢܐ). When the Temple stood in Jerusalem, and sacrifices were offered, "Qorban" was a technical Hebrew term for some of the offerings that were brought there. It comes from a Hebrew root, "Qarab", meaning "to draw close or 'near'". A required Korban was offered morning and evening daily and on holidays (at certain times, additional 'korbanot' were offered), in addition to which individuals could bring an optional personal Korban.
The Holy Qurbana is referred to as "complete" worship, since it is performed for the benefit of all members of the Church. The other sacraments are celebrated for individual members. Thus the Holy Qurbana is believed to be the sacrament that completes all the others. Hence it is called the "sacrament of perfection" or the "queen of sacraments".
Usage.
The East Syriac or Chaldean rite was associated with the historical Church of the East, centered in the Persian capital of Seleucia-Ctesiphon. Today the Liturgy of Mar Addai and Mari is used in the Ancient Church of the East, the Assyrian Church of the East, the Chaldean Catholic Church, as well as the Syro-Malabar Church and the Chaldean Syrian Church based in Kerala, India. 
Edessan Liturgical Rite.
The "Liturgy of Saints Addai and Mari" belongs to the Edessan Rite (East Syriac), the anaphora or "Eucharistic Prayer" that is part of this liturgy, possibly dating back to 3rd-century Edessa, and is the oldest in Christianity. This liturgy is traditionally attributed to Saint Addai (disciple of Saint Thomas the Apostle) and Saint Mari (a disciple of Saint Addai). In the form given in the oldest manuscripts, all of the High Middle Ages, this anaphora does not include the Words of Institution, a matter that raised ecumenical concerns.
Qudashe (Anaphorae).
Qudasha of Mar Theodore.
The "Qudasha of Theodore of Mopsuestia" is one of three Eucharistic liturgies used in the East Syriac Rite. It is currently employed by Assyrian Church of the East, Ancient Church of the East, the Syro-Malabar Church and to a lesser extend in the Chaldean Catholic Church, which are descendants of the erstwhile Church of the East. It is attributed to Theodore of Mopsuestia and is used from Advent until the Sunday of the Hossanas.
Qudasha of Mar Nestorius.
The "Qudasha of Nestorius" is one of the Eucharistic liturgies used by the erstwhile Church of the East. It is currently employed in the Holy Qurbana of the Chaldean Catholic Church, Assyrian Church of the East, Ancient Church of the East, and the Syro-Malabar Church, which are descendants of the Church of the East. It is a part of the East Syriac Rite, formally attributed to Nestorius, Patriarch of Constantinople and is traditionally celebrated for the Feast of the Epiphany, Commemoration of St. John the Baptist, Commemoration of the Greek Teachers: Mar Diodore, Mar Theodore the interpreter and Mar Nestorius, and also for the Wednesday liturgy of the Rogation of the Ninevites, and the Feast of the Passover (Holy Thursday).
Holy Malka.
Traditionally the East Syriac Churches use leavened bread for the Eucharist, like most churches of Eastern Christianity, but they are the only Churches to include the additional ingredient of Holy Malka (or Holy Leaven). Holy Leaven is a powder added to sacramental bread before it is baked. Despite the name, Holy Leaven does not actually contain a leavening agent. Instead, "hmira", fermented dough from previously used sacramental bread, is added and acts as leaven.
What the Holy Leaven does contain is remainder from the original Holy Leaven, renewed annually by mixing it with common ingredients.