Add the mustard seeds to a small saucepan, cover with water and bring to a boil. Immediately strain through a fine mesh strainer. Repeat this step 1 more time to remove any excess bitterness from the seeds.
PICKLE THE MUSTARD SEEDS
Add the water, vinegar, sugar, salt and bay leaf to the saucepan with the drained mustard seeds and stir to combine.
Bring the brine to a boil before reducing to a low simmer. Simmer for 15-20 minutes, or until the majority of the brine has been absorbed.
Remove from heat and stir in the shallots. Let cool before transferring to an airtight container in the refrigerator.
Notes
Note 1- Use your preferred color mustard seeds or mix and match (yellow, brown, black).Note 2 - Use any vinegar you prefer: apple cider vinegar and red wine vinegar are great options.Note 3 - A 5-6% acetic acid vinegar is recommended.