Subway's Sweet Onion Sauce

Step 1

In a small pot, whisk together all ingredients over medium high heat - allow to bring to a boil while whisking constantly.

Step 2

Reduce heat to low and simmer, stirring until thickened - around 5 minutes.

Step 3

Allow to cool in the refrigerator overnight.

Step 4

This sauce keeps indefinitely if stored in a sealed jar in the fridge.