Sanitize all work areas, cutting boards, equipment and sinks used in the preparation of this recipe.
Toast black peppercorns, fennel and coriander seeds in a heavy bottom pot or rondeau over medium heat until they bloom and become fragrant.
Add onion, lemongrass, garlic, sugar, salt and Water.
Bring to a boil, then reduce to a simmer.
Continue cooking until aromatic and the flavors develop, about 20 minutes.
Carefully pour brine into Ice Water.
Stir until thoroughly combined. Taste and adjust seasoning as needed.
Remove from the heat. Cool completely.
Transfer to clean food storage containers. Cover, label, date and store refrigerated.
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