Red Onion Marmalade - cooking recipe

Ingredients

1 1/2 lbs red onions
3 tablespoons unsalted butter or 3 tablespoons Earth Balance margarine
1/4 cup sugar
1 cup dry red wine
1/4 cup balsamic vinegar, plus
2 -3 teaspoons balsamic vinegar, if needed
1/4 teaspoon salt (to taste)

Preparation

Halve onions lengthwise and cut into thin slices.
Heat butter in large heavy skillet set over medium heat.
When melted and hot, add onions and sugar and stir occasionally until onions are soft and start to caramelize, 10 to 15 minute.
Add wine and 1/4 cup vinegar and stir until mixture almost comes to a boil.
Reduce heat and simmer until liquids have evaporated and onion is shiny, 15 to 20 minutes.
Remove from heat and sprinkle in salt, adding more if needed.
For tarter taste, stir in another 2 to 3 teaspoons vinegar.
The marmalade can be prepared 5 days ahead; cover and refrigerate.
Reheat, stirring, just to warm before using. Makes about 1 1/2 cups.