Lichte Uiensaus

Description
This light onion sauce goes well with white beans, lamb and mutton.

Ingredients

 * 4½ dl stock
 * 1 large onion
 * 30 g butter
 * 30 g flour
 * ½ dl vinegar
 * pepper and salt to taste

Directions

 * 1) Chop the onion fine and sauté it in the butter for about 10 minutes. Make sure it doesn't go brown.
 * 2) Add the flour and  mix the flour and butter to a white mass.
 * 3) Then add the boiling water or fish stock in small amounts, stirring well and in between bringing the sauce back to the boil.
 * 4) Then leave to boil for 10 minutes and season with salt.
 * 5) Take the sauce off the heat and add the vinegar.