We use chicken sausages or when we can find them, chicken hot dogs (can't eat beef or pork).

Sweet relish, especially on those Costco hotdogs.

When on a hike what did the daddy tomato say to the baby tomato when he fell behind? Ketchup

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Mustard, tomato, onion, cucumber, & sport peppers, with a dash of celery salt.
Which, BTW, is what we had last night!

So refreshing. In practice, I usually leave the cucumbers off.

Homemade vegan dogs with BBQ sauce and sweet relish. Son will add sweet-hot jalapeños and cheese, most likely. Sweet corn, baked tatties, and apple-cherry pie to round it out.

From tastes good.com:

The essential ingredients for making an Oki Dog include a hot dog, a tortilla, bonito flakes, shredded daikon, spicy mayo, and sliced green onions. Other ingredients such as diced cabbage, pickled ginger, and wasabi may also be added to enhance the flavor and texture of the dish.

Great minds and all that.

Onion, dill pickle slice, sweet relish, tomato, celery salt, sport pepper, mustard ,but no ketchup). Chicago style.