Negiyaki is traditionally eaten with soy sauce and a squeeze of lemon rather than okonomiyaki sauce, so the green onion's sweetness isn't buried under the thick brown sauce used on most Osaka griddle food.
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