Cut onions into rings then add vinegar and a pinch of salt. Set aside.
Peel plantains and cut in half or quarter if you’d like it to cook through faster
In a large pot over medium high heat, add plantain and another pinch or two of salt
Allow plantains to come to a boil
Remove plantains once they are soft
While the plantains are boiling, saute onions, salt, and vinegar. Be careful not to burn yourself as oil may pop
Once the plantains are ready, add butter, cold water or water from where the plantains were boiling, sauce from the onions and begin to mash
Mash until plantains are velvety smooth
In the end, add onions and sauce over top. Enjoy with fried Dominican Salami, Fried Dominican Cheese, and a Fried Egg for a traditional Dominican Mangu con Los Tres Golpes
