In Michoacán, drug cartels command parts of the valuable avocado business, and have reportedly infiltrated the industry and run extortion rackets, preying on producers in the state.
Tacos are staples of Mexico City palates. Thousands, if not millions of residents eat them every day from the thousands of street stalls and restaurants that dot nearly every corner of the capital.
So good is the substitute, according to some connoisseurs, that punters could be eating it without even noticing.
Once the courgettes are boiled up and blended with the rest of the ingredients - green tomato, coriander and chili peppers – and pureed into a creamy, smooth consistency, some culinary experts claim few could tell the difference.
"The scariest part is that it tastes almost exactly like your standard taqueria guacamole: bright, spicy, rich, and very satisfying," said Javier Cabral, editor of LATaco, a food and culture site and producer of Netflix series, Taco Chronicles.
Cabral, who says he has eaten over a thousand tacos this year alone, said: "It almost fooled me." The story was originally reported in the Mexico City magazine Chilango, equivalent to the UK's TimeOut, earlier this month.
In an editorial, the magazine said: "The advantages are the price (we don't have to tell you that courgettes are way cheaper than avocados, right?) and that the sauce stays greener for longer. Guacamole made with avocados – as it should be – goes black when it is exposed to the air, although that can be avoided with a little lime juice."