Step 1

Peel the plantains and cut lengthwise, then divide each half into two.

Step 2

Add the plantains to a pot and boil in enough water to cover them until they are very tender. Add salt to the water before the water breaks the boil.

Step 3

Remove the plantains from the water and mash them right away with a fork until they are very smooth and there are few to no lumps. Mix in butter, and water. Keep mashing and mixing until smooth.

Step 4

In a small bowl combine onions, vinegar and salt. Let sit for about 5 minutes.

Step 5

Heat a tablespoon of oil in a skillet over low heat. Add onions and cook while stirring until they become translucent, about 1-2 minutes.

Step 6

Garnish mangu with the onions and serve with eggs, Dominican fried salami and fried cheese.