Macadamia — Native to Australia’s rainforests, the macadamia has the hardest shell of any commercial nut, requiring roughly 300 pounds per square inch of force to crack. That toughness — plus a toxicity to dogs — helps make it one of the most expensive nuts in the world. is leading so far with 100%.
Everyone who has answered so far is voting from Singapore.
The poll is still live and picked up a vote today.