Grab a plate, scoop and then dip. All the usual suspects on a Chicago dog are found in this crowd-pleasing layered dip. If you can't find sport peppers in your area, try pepperoncinis instead. Make the day before and refrigerate to save time on game day.
Put the hot dogs in a food processor and pulse until coarsely chopped. Heat the oil in a large nonstick skillet over medium-high heat, add a third of the onions and cook, stirring, until soft and slightly golden brown, about 4 minutes. Add the garlic and stir for 30 seconds. Add the chopped hot dog and cook, stirring occasionally, until lightly golden brown, about 5 minutes. Remove from the heat and let cool completely.
Preheat the broiler. Open the buns and arrange on a baking sheet. Broil until toasted on each side, 1 to 2 minutes per side. Cut into small pieces.
Whisk together the mayonnaise and poppy seeds in a small bowl. Toss the cucumber and celery salt together in a small bowl.
Layer the dip in a medium, 3-quart glass trifle bowl or your favorite small serving dish. Spread out the tomatoes on the bottom, then top, in even layers, with the peppers, toasted buns, a generous drizzle of mustard, the remaining onions, the hot dog mixture, the pickles, poppy seed sauce, relish and cucumber. Wrap and refrigerate until chilled, at least 1 hour or overnight. Garnish with another drizzle of mustard and serve with potato chips.
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