While the sacrifice of Calvary is absolutely essential to the Eucharistic Jesus, my understanding from saints and priests over the years is that because God is outside of time He is present at every age in the Holy Eucharist.
I don't know where to find quotes at this point, but I believe St Padre Pio saw a vision of the Christ Child in the Holy Eucharist and saw Christ in the womb which revealed to Him that Mary is also present in an important way.
My NO Catholic school teacher in the 70's would admonish us not to chew the Baby Jesus when we received the Eucharist. :)
I heard a recent sermon explaining that the event of the Transfiguration was a way of showing us that Jesus was using considerable restraint to hide the truth of his nature behind His flesh while He was on earth. If His nature was allowed to be revealed it would have beguiled and overwhelmed everyone just as it did Peter.
They said that indeed the Transfigured Christ is present in the Eucharist where He is hidden behind the appearance of bread and if His flesh was truly revealed it would have the same level of amazing glowingness as the actual Transfiguration.
But blessed are those who believe who have not seen.