-
1
Place the chicken carcasses and pork bones in a large stockpot. Cover with cold water, bring to a boil, and blanch for 5 minutes. Drain, rinse the bones under cold water, and return them to the cleaned pot. Cover with fresh cold water and bring to a steady simmer. Skim diligently. The broth is ready to proceed when it runs clear of grey foam.
-
2
Simmer the bones steadily. In the final 30 minutes of cooking, add the niboshi directly to the broth. Do not exceed 30 minutes of niboshi contact — beyond this threshold, bitter compounds from the sardines overpower the broth. Remove the niboshi at exactly 30 minutes; the broth should carry a clean oceanic-bitter edge detectable on the first taste.
-
3
Strain the broth through a fine-mesh sieve, discarding all solids. Season with the soy tare — a blend of multiple soy varieties — to build a dark, clean shoyu character. Taste: the broth should read savoury and complex, with the niboshi's oceanic depth present but not dominant.
-
4
Render the pork back fat in a small heavy pan over low heat, stirring occasionally, until it has melted entirely to a liquid white pool. Do not brown it — the rendered fat must remain pale and clean, not toasted. The fat is ready when it runs completely liquid and shows no solid white pieces remaining.
-
5
This is where the dish lives or dies: ladle the hot broth into each warmed bowl, then spoon 1–2 tablespoons of the rendered pork back fat directly onto the broth's surface. The fat must float visibly as a white oil island on the dark broth — it must not be stirred in, emulsified, or submerged. At service, the fat layer and the dark broth beneath it must be clearly distinct. Any bowl in which the fat has been integrated before it reaches the diner has lost Onomichi ramen's defining structural character.
-
6
Cook the flat wavy noodles according to their weight in vigorously boiling water. Drain well and lower into the prepared bowls beneath the broth. The noodles' flat, wavy surface captures the fat layer as they are lifted — this is their functional role in the dish.
-
7
Dress each bowl with the traditional toppings. Serve immediately. The diner breaks the back fat layer with the first stir of chopsticks, integrating it deliberately — the bowl will taste progressively richer from first sip to last, the final spoonfuls entirely transformed by the fat's gradual dissolution.