I must confess the Church threw the baby out with the bathwater on many Hebrew ordinances and feasts God stipulated in his word and through his prophets. The Covenants changed. God did not. His intentions did not.
And what man removes that God put in place, the void is instantly filled with something from the devil (though man thinks it's his idea and for the good of all) namely: religion.
The Lord's supper is Passover. Attend one (especially a Mesianic one) and you will see that it is all about Jesus. "This is my body..." "This is my blood..." i.e. Jesus is the Passover Lamb, the middle piece of unleavened bread (Christian communion has no idea what "the middle piece" even means... )
Holding up the matzoh (unleavened bread) you can do a Bible lesson on Isaiah 53 and Psalm 22 "he was bruised for our iniquity" the burnt marks on the matzoh look like bruises, there are grill marks on it "by his stripes we are healed" the matzoh is poked with a fork or sharp instrument to keep it from rising leaving holes. "they pierced my hands and feet" and in Zechariah "they will mourn for him whom they have pierced..."
That middle piece of matzoh is broken in half (half is wrapped and hidden) Jesus's body was broken for our sins. It was wrapped in grave clothes and placed in a tomb.
Children later hunt for the piece of wrapped matzoh and get a prize.
"Unless you become as little children you cannot enter the kingdom of Heaven."
This piece (the affikhomen; a greek word the Jews to this day cannot figure out how it got into even the Orthodox Passover Seder) is then broken and partaken of by the entire congregation (like the crackers in communion).
There are four cups of wine at the Passover Seder:
"1. I will bring you out from under the burdens of the Egyptians, and 2. I will rid you from under their bondage and 3. I will redeem you with a stretched out arm and with great judgments: and 4. I will take you to Me for a people and I will be to you a God."
The four cups at the Seder represent the four expressions of redemption--bring, deliver, redeem and take.
The first cup is called the cup of sanctification;
the second, the cup of judgment;
the third, the cup of redemption;
and the fourth, the cup of the kingdom.
Jesus drank the third cup and said he would not drink the fourth until that cup is fulfilled. So, it was an incomplete Seder but marking the Seder's actual fulfillment (by him the Messiah that was to come) through the third cup.
Get a book on the Passover (Haggadah).