Everyone likes to have a go at "eating like a local" on holiday, but where do you draw the line? If you think you're a proper foodie traveller, then check out our list of the most challenging local delicacies to try on your next trip.

'Virgin boy eggs', China

Like tea eggs but with a little something extra, “virgin boy eggs” are soaked, boiled and then cured in young boys’ urine, and then eaten as a springtime delicacy. They’re famous in Dongyang, Zhejiang province (120 miles south of Hangzhou), which has officially recognised them as a cultural heritage marker. Be prepared to stump up for them – they cost about double the price of a normal boiled egg. The urine, by the way, comes from schoolboy volunteers.

Bull testicles, Canada

“Prairie Oysters” sounds like a tempting dish when you see it on the menu… until you realise it’s made of deep-fried testicles, whether that's bull, pig or sheep. Traditionally served in the cattle-ranching wilds, you can also get them in the US (where they’re known as Rocky Mountain Oysters or calf fries) and in Spain and Argentina, where they’re called criadillas. Sometimes they’re flattened before being coated and fried; sometimes they’re left au naturel.

Fried tarantulas, Cambodia

Take the bus from Phnom Penh to Siem Reap and you may well get the chance to eat one of Cambodia’s most popular street foods en route. Fried tarantulas are something of a delicacy, and served everywhere from street stalls at rest stops to upmarket restaurants in the capital. They’re less tasty than you’d think, but what they lack in flavour they make up for in crunch. Build up to them, if you like, with ants or crickets – two other popular dishes in Cambodia.

How about a nice plate of fried tarantulas in Cambodia? (Getty)

Puffer fish, Japan

Japanese chefs have to undergo three years of training before they’re allowed to prepare fugu, or puffer fish. Its best known component, tetrodotoxin, has to be removed without contaminating the flesh, because a little of it leads to euphoria, but too much can lead to paralysis and death. In Japan, fugu sashimi is considered a huge delicacy – the liver is the tastiest (and most expensive) part, though it’s also the most poisonous, turning every mouthful into Russian roulette.

Eating this guy is like a foodie version of Russian roulette (Getty)

Fermented shark, Iceland

It’s the national dish of Iceland that Anthony Bourdain called the “single worst, most disgusting and terrible tasting thing”. Kaestur hakari, or “treated shark” , is shark that’s been fermented and dried out for up to five months; it tastes of fish, as you might expect, and smells of ammonia, which you might not. It’s popular enough to be sold year-round, but is part of the traditional borramatur buffet served during winter – especially during Thorrablot, the midwinter feast, where it sits alongside boiled sheep’s head, ram testicles and seal flippers. Yum.

Fermented shark was called 'the single worst thing' by Anthony Bourdain (Chris Wronski/Flickr)

Fertilised eggs, Philippines

“Balut” means “wrapped” in Tagalog, and that’s one way of describing this – a semi-developed egg that’s boiled and eaten, embryo and all. Best known in the Philippines, where it’s a popular street food (normally a duck egg), it’s eaten throughout South-east Asia. The eggs are incubated for roughly two weeks, and they’re feted for their extra protein levels. One for the paleo crowd?

Ant larvae is a much-loved dish in Mexico (Getty)

Ant larvae, Mexico