Red Onion Marmalade - cooking recipe

Ingredients
    2 tablespoons olive oil
    1 tablespoon butter
    2 large red onions, thinly sliced
    1/4 cup white sugar
    1 cup dry red wine
    1/4 cup balsamic vinegar
    salt to taste
Preparation
    Heat olive oil and butter in a large skillet over medium heat; cook and stir onions and sugar in hot oil until onions start to caramelize, about 15 minutes. Stir red wine and balsamic vinegar into onion mixture and bring to a boil. Reduce heat to medium-low and simmer until liquid is evaporated, 15 to 20 minutes more. Season with salt.

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