Step 1

Add the sugar and vinegar to a pot set over medium heat.  Bring the mixture to a simmer, stirring occasionally.  Simmer for about 2 minutes. Add the sliced jalapenos and stir to combine.

Step 2

Return to a simmer and cook the jalapenos, uncovered for 10 minutes, stirring occasionally. The jalapenos will shrink in size and change colour. Turn off the heat and let them rest for 10 minutes.

Step 3

Add the coriander seeds and bay leaf (if using) to a heat proof jar). Transfer the jalapenos and syrup to the jar. Press down the jalapenos so they are mostly submerged in the syrup.