Genesis 45:18
And take your father and your households, and come unto me: and I will give you the good of the land of Egypt, and ye shall eat the fat of the land. And take your father and your households, and come unto me: and I will give you the good of the land of Egypt, and ye shall eat the fat of the land.
Pharaoh confirms Joseph's invitation for his father and his households to come to him in Egypt. The good of the land of Egypt is offered to them, with its abundance to be theirs as they join Joseph. That offer is followed by provisions and carriages for the family's move.
The fat of the land is grains, vegetables, and fruits. That vegetarian diet gives health and happiness. It is far less expensive than flesh, butter, sweet-cake and pies, lard, saleratus, pepper, vinegar, pickles, allspice, cinnamon, ginger, and nutmeg, so changing to it saves money.