Sofrito

Heat Exra Virgin Olive Oil from Spain in a deep sauce or saut pan over a medium-high flame. Add the onions and reduce the heat to low.

Braise the onion slowly covered, stirring often, especially at the end. The onions will turn translucent, then golden. This should take about 30 minutes.

When the onions are done, add in the tomatoes. Gently simmer, uncovered, for 60 and 75 minutes, gradually adding in the conserved juice as the liquid evaporates out.