The book only gives you the recipes that can be learned from watching Queen of Sauce. Useful if you don't check the TV.
Many of the recipes are learned by befriending townspeople. Then they send you their recipes to your mailbox.
There are also a few that you buy the recipes for, at the Saloon, the volcano dwarf shop, Island Trader, and when Gus visits Ginger Island and opens a temporary drink bar.