Caramelized Onion Relish - cooking recipe

Ingredients

1 tablespoon butter
1 1/2 onions, finely diced
1 1/2 tablespoons brown sugar
1 1/2 tablespoons apple cider vinegar

Preparation

In a medium pot, melt butter until foam subsides.
Add onions and cook over low to medium heat until they are very soft, 10-15 minutes.
Add sugar and apple cider vinegar and cook gently until onions are golden brown, stirring frequently, another 10-15 minutes.