Step 1 : Introduction to the question "Which nut is considered the world's toughest nut to crack?"
...What does the idiom tough nut to crack mean? hard nut to crack. Also, tough nut to crack. A difficult problem; also, an individual who is difficult to deal with. For example, This assignment is a hard nut to crack, or It won't be easy getting her approval; she's a tough nut to crack. This metaphoric expression alludes to hard-shelled nuts like walnuts.
Can you eat raw macadamia nuts? A.: The raw macadamia nuts are fine to use just as they are, for eating out of hand or baking. If you want to roast them, here is the method recommended by the Gold Crown Macadamia Association, a California nut-growers cooperative: ... Avoid roasting small meats and half pieces with larger whole nuts.