Mashed Spinach with Onion

Description
In Romanian: Pire de spanac cu ceapa.

Ingredients

 * 3 lb / 1,5 kg spinach
 * 2 tablespoons butter
 * 1½ cups milk
 * 1 small onion
 * 1 teaspoon flour
 * pinch of sugar
 * salt

Directions

 * 1) Fry the finely chopped onion in butter, add flour, mix and then pour the milk.
 * 2) Add the cleaned, washed, scalded and finely chopped spinach, salt and sugar and simmer until the liquid is reduced.
 * 3) Serve this dish with French pancakes or croquettes.