Sriracha Pulled Pork Buns

Ingredients

• 6 tbsp brown sugar
• 1 tbsp garlic powder
• 1 tbsp kosher salt
• 2 tsp freshly ground black pepper
• 2 tsp ground cumin
• 2 tsp smoked paprika (or 1 tsp smoked & 1 tsp hot)
• 4 cups water
• 1/4 cup kosher salt
• 1/4 cup brown sugar
• 1 red onion, sliced
• 3 cloves garlic, minced
• 3 bay leaves
• 1 cup ice cubes
• 6 8-lb bone-in pork shoulder (Boston butt)
• 3 tbsp yellow mustard
• 1/3 cup Sriracha sauce*
• 1/4 cup cold water
• 12 buns (preferably sweet Pan de Sal)