Joerg, I understand that the onions should not dissolve completely, and keep a golden appearance. Curiously Neruda does not mention any wine. I would add some white wine and let alcohol evaporate before adding the cream.

Moreover I think the cream will add favorably to the flavors but will be an addition of fat, and probably should be avoided or reduced in favor of health.

For the sake of health too, don't forget to serve a bottle (or more) of good Chilean wine, and good crackling French bread.

Un abrazo - Andrés