Toast the bun on a flat-top grill. Stack the potato salad, brisket slices and pickles on the bottom bun. On the top bun, drizzle Sriracha in a circular motion and then make a heart with the Sriracha. Cover the sandwich with the top bun and secure with a skewer.
Put the potatoes in a large pot of heavily salted water. Cover and bring to a boil. When the water reaches a boil, the potatoes are done cooking. Strain the potatoes and plunge them into an ice bath for 3 minutes.
In a large bowl, combine the bell peppers, cilantro, roasted garlic, jalapenos, black pepper, salt and the cooled potatoes.
Potato Salad Dressing:
Put the mayonnaise, vinegar and mustard in a stand mixer; mix on low speed. Add the black pepper, garlic powder, onion powder, celery salt and parsley; mix until well blended, scraping the bowl occasionally.
This recipe was provided by a chef, restaurant or culinary professional. It has not been tested for home use.