Negiyaki actually predates okonomiyaki sauce — it was originally eaten with plain soy sauce because the thick, sweet-savory sauce now smothering most Osaka griddle food hadn't been invented yet.
A thin batter loaded with a heap of sliced green onion instead of cabbage is grilled on a teppan into a lacy, light pancake, then finished with soy sauce or a dashi-soy dip rather than the thick brown sauce used on okonomiyaki.
Takoyaki (Octopus Balls)
Yakitori (Skewered Chicken)
Sapporo Miso Ramen