By Luke Abrahams In search of untouched culinary gems in the lesser-visited regions of Vietnam, the strange and beautiful country, by Luke AbrahamsWhen you think of Vietnamese food, chances are you’d be hard-pressed to name anything more than a bowl of pho or a bánh mì baguette. It’s okay, don’t be too hard on yourself: London, as richly flavourful and cosmopolitan as it is, only offers a mere smidge of the flavours Vietnam has to offer. I first realise this in Hanoi, capital of this welcoming socialist republic. I am sitting in Café Giang in the city’s Old Town, a small hole-in-the-wall coffe…