Beat Bobby Flay Fried Chicken Sandwich

Name: Beat Bobby Flay Fried Chicken Sandwich
Ingredients: 2 chicken thighs, skinless; 2 tablespoons flour; 1 egg, beaten; 4 tablespoons breadcrumbs (I used Panko); Salt; Pepper; 1+1/2 cups cider vinegar; 1 teaspoon mustard seeds; 1 teaspoon coriander seeds; 2 tablespoons sugar; 3/4 cup dill pickles, finely diced; 1 small red pepper, grilled, peeled, seeded, and finely diced; 1 small jalapeno, grilled, peeled, seeded, and finely diced; 1 small white onion, finely diced; 2 diner rolls; 2 tablespoons mayo; 1 handful arugula