Subway Sweet Onion Sauce

In a saucepan, combine sugar, red wine vinegar, and white vinegar.

Bring the mixture to a boil over medium heat, stirring occasionally to dissolve the sugar.

Reduce heat and simmer for 10–15 minutes until slightly thickened.

Remove from heat and let cool.

Store in an airtight container in the fridge. Use within 1–2 weeks.

Serving and Storage Tips