Wash the cauliflower thoroughly, remove the leaves, and cut the head into small bite-sized florets.
Bring a pot of water to a boil, blanch the cauliflower for about one minute, then transfer it immediately into cold water to maintain its crunch.
Place garlic, ginger slices, turmeric, and mustard seeds into clean glass jars.
Pack the cauliflower florets into the jars, leaving enough room for the brine to circulate around each piece.
Heat vinegar, water, salt, and sugar together until the ingredients dissolve into a smooth pickling liquid.
Pour the warm golden brine over the cauliflower until all florets are covered.
Cool the jars completely, refrigerate, and wait at least one day before enjoying the full turmeric and ginger flavor.