The article introduces the finger lemon, also known as the fish roe lemon, the world's most expensive lemon, selling for up to 3 million VND/kg. Originating from Australia, this lemon is favored by chefs due to its unique shape and flesh, resembling fish roe. However, it is difficult to grow and requires specific conditions. The tree can yield a maximum of 1.5kg of fruit. The article also highlights the potential scam of selling non-finger lemon trees as such, advising consumers to buy from reputable sources and preferably, those with bearing trees.