Barbecue Chicken Sliders

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2 Persian cucumbers, thinly sliced

1/2 red onion, thinly sliced

1/4 cup white vinegar

1/2 teaspoon mustard seeds

1/2 teaspoon sugar

Kosher salt and pepper

3 cups shredded rotisserie chicken

1 cup barbecue sauce

1 tablespoon Dijon mustard, plus more for the buns

8 sweet Hawaiian rolls

Fresh cilantro leaves, for topping