This rather bizarre fruit is a Jam-Paa-Daa, similar to a jack fruit. It's from the south and it stinks! It's a real struggle to open too, I needed the help of my neighbor simply to prise the thing open!
What does it taste like? Well, a bit like Durian crossed with Jackfruit, but that doesn't really capture the smell and taste, but it does describe the texture perfectly.
Look out for it in Thai market in the south of Thailand.