Ingredients

1 small red onion, thinly sliced into rings 

3/4 cup rice-wine vinegar 

1/4 cup sugar 

2 teaspoons coarse salt 

2 whole cloves 

Preparation

Put onion slices into a saucepan, and cover with water. Bring to a boil; drain, and transfer to a nonreactive bowl.

Bring vinegar, sugar, salt, and cloves to a boil in the saucepan. Pour over onion slices, and let cool. Refrigerate in an airtight container for at least 2 hours (or up to 1 month).