Or HaChaim on Genesis 45:23/אור החיים על בראשית מ״ה:כ״ג

1 ולאביו שלח כזאת, To his father he sent the following: The reason the Torah added the word זאת instead of merely enumerating the list of provisions and gifts which appear in this verse is to tell us that what is described as מטוב מצרים, Egypt's best [produce], something which the Torah had not identified, referred to the quality of the various items listed. The verse therefore says: "Of all the items listed forthwith Joseph sent his father of the best quality available in Egypt." Our sages in Megillah 16 describe the words מטוב מצרים as referring to wine which had been aged for a long time. Bereshit Rabbah 94,2 identifies טוב מצרים as some kind of special white beans, a medication with anti-depression properties. If that were so, the verse should have written בזאת, instead of זאת and has to be understood as if the word עשרה חמורים had a conjunctive letter ו at the beginning.

2ועשר אתונות נושאות בר, as well as ten she-asses carrying grain and bread, etc. The reason the Torah repeats the word לאביו, for his father, a second time is to tell us that it was not a separate consignment. The Torah meant that apart from the load carried by these she-asses, i.e. the grain and the bread, there were special delicacies for Jacob only. Joseph instructed his brothers that these items were meant only for his father.