Pickled Red Onions - cooking recipe

Ingredients

1 large red onion, halved through core, thinly sliced crosswise
1/2 cup sugar
1/2 cup white wine vinegar
1 1/2 teaspoons coarse kosher salt
1 1/2 teaspoons whole black peppercorns
1/2 cinnamon stick

Preparation

Place onion slices in medium bowl.
Bring next 5 ingredients to boil in heavy medium saucepan; pour over onions in bowl.
Cover; cool to room temperature.
Chill overnight.
DO AHEAD: Can be made 3 weeks ahead. Keep chilled.
Drain before serving.