SandwichShortOfAPicnic
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Thanks for that. Very informativeThey are unripe. When you cut the mango in half, the pit is still white, and soft. They're often picked straight off the tree and are prized for their eye-scrunching acidity. I'd say the closest thing in the UK is a slice of one of those huge cooking apples (OMG! What I'd do for one of those right now! Enormous, misshapen apples from my youth, which were perfect for apple pies, not like the bland, perfectly formed Granny Smith excuses you get in the supermarkets these days!)
This is what a green mango looks like. I've just cut one open:
View attachment 128272
You can see that the pit is still white, and the flesh , which is hard and very acidic, is white as well.
Over here in Venezuela, they sprinkle the mango with salt, and eat it like that. In India, they slice them, dry them in the sun and then grind them into a powder called amchoor, which is used in cooking. In other SE Asian countries (especially Thailand and Indonesia) they're used in spicy salads, like yam mamuang or rudjak.

I never knew amchoor was mango!
I can see why it’s not popular here.
You’re spot on about cooking apples, they did use to be enormous and super sour!