The 49-year-old and his partner Angelina Jolie are known to have loaded cupboards with jam in both their Los Angeles and Cote d'Azur mansions, reported Daily Mirror.
Pitt first tasted the jam when he and his eldest son Maddox, 11, flew to Alsace, where the fruity delicacy is made. Then, Pitt immediately tracked down its maker Christine Ferber. After which Pitt decided to visit her in person during a recent break in filming.
"Brad is very particular about what he eats but fell in lust with this jam. He turned detective and discovered Christine has a little shop in the Alsace region, where she makes the artisan jams.
It is very well known among the jam-making fraternity," a source said. "From here, he jumped on a plane with Maddox and checked the place out first-hand. They had a brilliant time, tasting loads of jams and Christine's other homemade delicacies.
They came away with dozens of pots. He and Angelina have now had to designate a special room just to store it in their Brignoles villa. And now Brad is even beginning to experiment with recipes of his own," the source added.