To make the slaw, stir together the cabbage, jalapeño, onion, garlic, cilantro, salt, cumin, mayonnaise, and mustard until well combined. Taste and adjust seasonings and add more mayonnaise and/or mustard if desired. Chill until ready to serve.
Warm up the corny dogs and tortillas.
To assemble the tacos, place on a warm tortilla a couple spoonfuls of the slaw, the place on top of the slaw the corny dog.
Squiggle the dog with mustard, then garnish with jalapeño slices, cilantro, Cotija cheese, and hot sauce. Remove the stick if you haven’t already, fold the taco, and eat.