"Jesus and the Jewish Roots of the Eucharist" sets out to prove that the bread and wine in the Eucharist/Communion are literally Jesus' flesh and blood. The author stated that he would use the Bible and ancient Jewish sources to prove that's how the Jews would have understood it.
There was some cultural background information, but it wasn't very comprehensive as the author tended to ignore anything that didn't directly support his argument. The first part of chapter 6 did do a good job of giving details about the "order of service" for the Passover at the time of Jesus, but "Christ in the Passover" by Ceil Rosen and Moishe Rosen covers the same information and more if you're mainly interested in that.
If you're looking for a book that explains or proves the Catholic beliefs about the Eucharist, then I wouldn't recommend this book. Despite all the quotes, the author's core arguments used his assumptions about the Eucharist to "prove" his assumptions.
For example, one core argument was that eating the Passover lamb was necessary during the original Passover or the firstborn son would have died even if the lamb's blood was on the doorpost. To quote from page 56, "If they took the lamb, sacrificed the lamb, spread the blood of the lamb, but did not eat the lamb, what would have been the result? Well, the Book of Exodus does not say. But it's a good guess that when they awoke the next morning, their firstborn son would be dead."
So he admits he can't prove this idea using the Bible. (In fact, Exodus 12:13, 22-23 makes it clear that the only requirement for having the house "passed over" was the blood on the door frame and staying inside that house.) He also didn't quote a single ancient source that said if someone in the family--or even just the firstborn--didn't eat the lamb, then the firstborn would die. So he bases his core argument on what he calls "a good guess" but which actually contradicts Scripture. Many of his arguments had this same flaw.
One of his stronger arguments could have been John 6:55. His argument (from page 101) is, "It is widely recognized by New Testament scholars--Protestant and Catholic alike--that Jesus is speaking here [in John 6:48-59] about the Eucharistic food and drink that he will give the disciples at the Last Supper....any attempt to insist that Jesus was not speaking about what he would do at the Last Supper here is a weak case of special pleading." So his argument is "don't question what I'm saying, the authorities back me up." He didn't even quote an ancient source that supported his view.
But read the chapter for yourself. In John 6:32-59 and during the Last Supper, Jesus is talking about his death and resurrection. It's a minor but important difference. Yes, Jesus' words in both places have similarities, but that's because they refer to the same event. The author gave no evidence that Jesus meant his speech in John 6:48-59 as a commentary on how to understand the yet-to-happen Last Supper.
The author's claim that Protestant scholars agree with his claim is untrue. After studying the passage for myself, I looked up what a few scholars had to say and it was easy to find scholars that disagree with Pitre. For example, from "Commentary Critical and Explanatory on the Whole Bible" by Jamieson, Fausset and Brown, commenting on John 6:51, "...our Lord explicitly introduces His sacrificial death--for only rationalists can doubt this not only as that which constitutes Him the Bread of life to men, but as THAT very element IN HIM WHICH POSSESSES THE LIFE-GIVING VIRTUE."
And commenting on John 6:53-58, "He says they must not only 'eat His flesh' but 'drink His blood,' which could not but suggest the idea of His death--implied in the separation of one's flesh from his blood. And as He had already hinted that it was to be something very different from a natural death, saying, 'My flesh I will give for the life of the world' ( John 6:51 ), it must have been pretty plain to candid hearers that He meant something above the gross idea which the bare terms expressed. And farther, when He added that they 'had no life in them unless they thus ate and drank,' it was impossible they should think He meant that the temporal life they were then living was dependent on their eating and drinking, in this gross sense, His flesh and blood."
Finally, some of the information Pitre used to support his position could equally support the Protestant view. This is true for the Scripture he quoted, especially when it's read in full context or along with other verses that he failed to quoted.
So, overall, I wouldn't even recommend this book to Catholics since his arguments weren't properly supported.
I received this book as a review copy from the publisher.