Best Caramelized Onions

Onions that cook down very slowly and are transformed into an extraordinarily sweet, richly colored side dish or accompaniment.

Melt the butter in a large skillet , add the onions.

Cover and cook over low heat 30 minutes.

Remove cover , raise the heat , stirring to keep the onions from sticking.

As soon as the onions begin to brown- in about 10 minutes- lower the heat.

Cover and cook for 10 minutes.

Repeat step 2.

Repeat step 3.

Add the vinegar , salt and pepper.

Turn the heat to high and stir with a wooden spoon until the vinegar is evaporated~ about 5 minutes.

This dish can be made in advance.

To reheat: cook over low heat for 10 minutes.

Large , mild-flavored onions work best.

Caramelized onions can be frozen in an airtight container up to three months.

onions, butter, red wine vinegar, salt & freshly ground black pepper