Sweet & Spicy BBQ Chicken Sandwich With Pickles

Name: Sweet & Spicy BBQ Chicken Sandwich With Pickles
Prep time: 40 min
Cook time: 20 min
Total time: 1 h
Cuisine: American
Ingredients: 1 Kirby or ½ English hothouse cucumber, sliced into 1/4-inch-thick half-moons; 1/2 cup unseasoned rice vinegar; 2 tablespoons granulated sugar; 3 to 4 chiles serranos, thinly sliced; 1 tablespoon toasted white sesame seeds; 1/2 cup piloncillo or dark brown sugar; 1/3 cup sambal oelek; 1/4 cup fish sauce; 1/4 cup Sriracha; 4 garlic cloves, finely grated; 3 tablespoons white miso; 1 tablespoon finely grated ginger; 4 boneless, skinless chicken thighs; 4 sesame seed buns, toasted; 2 scallions, thinly sliced; 1 cup cilantro leaves and tender stems