This is Argentine national jam. If you could only try two Argentine delicacies in your trip, they would be meat and dulce de leche. An Argentine piece of advice! In fact, dulce de leche is simply milk marmalade. This jam is not very frequently eaten in France or Europe but it has national Argentine status and you cannot miss it because you will find it everywhere.
Dulce de leche is said to have existed in Egyptian times, however, Argentineans do not want to admit it: the popular tradition says that an American-Indian working for famous General Rosas was who forgot the milk with sugar on the cooker. Dulce de leche is said to have been born one night in 1829 when the General was about to enter into a treaty of peace. Anyway, Argentina is the main manufacturer worldwide and it is the country with more consumption per person all around the Earth.