This is a far more palatable fruit than that, though "strange" is still the mot juste. It is labelled as dragon fruit, and it is easy to see why:
It looks quite exotic and interesting, so even at £1.89 a pop it seemed worth a try. You can peel it, or (and this seems to be the better option) slice the top off and eat the innards with a tea-spoon. If you do that, it looks something like this:
The first time you see it, that's a bit worrying. It's described as white flesh, but at first glance I have to say I thought it was grey! The random scatter of seeds through the flesh is also slightly off-putting. Seeds tend to be tidily arranged in most fruit, and the dragon fruit's disdain for convention sparks suspicion of subversive intent.
When you brave it with a spoon, it's a bit of an anti-climax. The consistency's somewhere between watermelon and pear - it scoops out easily, but holds its shape. It has sweet juice, but doesn't have a strong or distinctive flavour. It's most like a kiwi fruit.
It turns out the dragon fruit is the fruit of a cactus, and it originates in the Americas, although it's farmed in the Far East. The ones at Tesco seem to come from Vietnam.
I don't think this will be a regular purchase, and I wouldn't suggest going out of your way to track them down, but if you see them somewhere they are probably worth a try at least once. One of these eaten with a spoon makes a nice light dessert.