Limoncello Poisoning: Parents Reveal Deadly Purchase

Here’s a summary of ⁣the provided text:

British⁢ couple, Greta ⁣and ⁢Arno, died after consuming⁢ limoncello in Vietnam.

* They received two bottles of limoncello as a⁢ gift from a local restaurant on Christmas Eve after having dinner.
* ⁢ The limoncello was found to be contaminated wiht ⁣methanol, a toxic industrial chemical.
* Greta⁣ initially complained of a severe hangover and vision problems (“black spots”).
* ⁤Their bodies where discovered three days later by ⁢a cleaner.
* A bartender has ‍been⁣ arrested in ⁢connection with the⁤ case.
* It’s currently unclear ⁣how ⁢the methanol entered the drink.