Step 1

Place all the ingredients, except the xanthan gum, in a saucepan over medium heat. Whisk together.

Step 2

Bring to the boil and reduce by about ¼ of a cup (keep a close eye on the sauce as it is prone to boiling over).

Step 3

Sprinkle the xanthan gum over and whisk in.

Step 4

Continue to boil until the sauce has thickened, then remove from the heat.

Step 5

Stir through the sesame seeds, if using.

Step 6

Serve the hot sauce over chicken, fish, steak or vegetables or allow to cool to room temperature before storing in an airtight container in the fridge.