Three years ago, I found myself reporting from a Kenyan avocado farm for the Irish Farmers Journal. The fruit of choice on the brunch table of Dublin’s millenials was flying off the shelves all over the developed world. Yet the farmers growing it were struggling: with no banks willing to take the risk of investing in African agriculture, they were dependent on cash-strapped traders roaming the countryside in their lorries on the hunt for the lowest-priced produce available.  Once the lorries hit the cities, the merchants made their cash, filled the tanks and went back out to the farmers waiting…