01 - Place the oil, black peppercorns, coriander seeds, cumin seeds, mustard seeds, dried chilies, garlic, ginger, cinnamon stick, and bay leaves into a small saucepan.
02 - Heat gently over low heat until the oil shimmers and spices release their aroma, about 8 to 10 minutes. Avoid letting the oil smoke.
03 - Remove from heat and allow the oil to cool completely with the spices still inside to deepen flavor extraction.
04 - Strain the infusion through a fine-mesh sieve into a clean, dry bottle or jar, discarding the solids.
05 - Keep the spiced oil refrigerated in a sealed container for up to two weeks.