Adam Clarke on Genesis 45:23

Meat for his father by the way - מזון mazon, from זן zan, to prepare, provide, etc. Hence prepared meat, some made-up dish, delicacies, confectionaries, etc. As the word is used, 2Chr 16:14, for aromatic preparations, it may be restrained in its meaning to something of that kind here. In Asiatic countries they have several curious methods of preserving flesh by potting, by which it may be kept for any reasonable length of time sweet and wholesome. Some delicacy, similar to the savory food which Isaac loved, may be here intended; and this was sent to Jacob in consideration of his age, and to testify the respect of his son. Of other kinds of meat he could need none, as he had large herds, and could kill a lamb, kid, sheep, or goat, whenever he pleased.