Mariella Frostrup presented the grower based in the River Till Valley in Northumberland with the award at a London bash recently.
The winners were selected by the readers of the newspaper's food magazine and a panel of food experts looking for contributions to the "creation of good, honest food".
Anthony and Lucy Carroll's crop was "in a different league entirely", according to the Observer.
"The Carrolls' potatoes were bred years back to satisfy that time-honoured criterion: flavour. Sample them blind and the contrast with standard spuds we eat is striking."
Carroll's Heritage Potatoes won the best producer gong. Other winners included Jamie Oliver as top food personality, and a host of restaurants.