Presumably He ate ordinary bread and wine when they were at table, but before He instituted the BLessed Sacrament.
Right here....
Matthew 26:27-29 And he took a cup, and when he had given thanks he gave it to them, saying, Drink of it, all of you, for this is my blood of the covenant, which is poured out for many for the forgiveness of sins. I tell you I will not drink again of this fruit of the vine until that day when I drink it new with you in my Father's kingdom.
A couple things to consider.
One is that Jesus had to participate in the Passover as any observant Jew would have to remain without sin.
That would include not eating of blood, which would have broken God's clear commandments and thereby sinning, which would have rendered Him incapable of being the lamb of God who takes away the sin of the world.
The only reason His death was able to conquer sin and death is because He was sinless.
1 Corinthians 15:56 The sting of death is sin, and the power of sin is the law.
“I didn’t see in Scripture where Jesus received or consumed the consecrated elements at the Last Supper, Himself. It says supper was finished; it says He blessed the bread, broke it, and gave it to his disciples;”
After He blessed and broke the bread, and offered it to His disciples, Paul writes “After the same manner also he took the cup, when he had supped,” (1 Co 11:25). Thus, they, all of them, had eaten of the bread that was just offered, and “when he had supped,” offers up the cup which he blessed saying “this is my blood.” With the same cup in hand, which had already been allegedly transformed into His real blood, He says “But I say unto you, I will not drink henceforth of this fruit of the vine, until that day when I drink it new with you in my Father’s Kingdom” (Matt 26:29). Thus, “this” fruit of the vine, He held in His hand, He would not “henceforth” drink, obviously indicating that this would be the last drink of wine He would have till the culmination of the Kingdom of God and all the Apostles are reunited with Him in the next world.
Thus, your argument that He did not drink and eat, or that He drank and eat before He blessed anything, is pure fantasy.