In a heavy-bottomed Dutch oven over low heat, add the olive oil and onions. Do not move until they start turning slightly brown in color, about 1 hour.
In the meantime, grind the chicken in a food processor until the meat is chunky but uniform, using 10 short pulses. Scrape into a bowl and stir in the ricotta, Worcestershire, 1 tablespoon salt, 1 teaspoon pepper and the parsley. Mix well. Form the chicken mixture into small patties, about 3 inches in diameter and 2 inches high. Place on a sheet tray and refrigerate.
Once all the onions are caramelized, deglaze with the whiskey and add the sugar 2 tablespoons salt and 1 teaspoon pepper. Let the onions caramelize for another 10 minutes, then set aside.
Preheat the oven to 200 degrees F.
Heat a cast-iron skillet over medium-high heat until it is hot, about 5 minutes. Add the vegetable oil and, in batches, cook the sliders until a meat thermometer registers 165 degrees F in the center, about 5 minutes on each side. Remove from the pan and hold warm on a sheet tray in the oven. Continue until all the sliders are cooked. Butter the rolls and toast in a saute pan over medium-high heat until golden brown.
To assemble, place a chicken slider on the bottom roll, top with the onion marmalade and spread the 18,000 Island Dressing on the top roll. Garnish with a cornichon or pickle spear. Serve immediately.
In a food processor, blend the egg yolks for 10 seconds until they are ribbony. Add the lemon juice and slowly add the oil in a steady, fine stream. When the mayonnaise is light in color and all the oil is incorporated, transfer to a bowl and add the hot sauce, capers and ketchup. Mix well.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.