Living On Food: Chef John's Sloppy Chickens

Ingredients

• 1 tablespoon vegetable oil for frying
• 4 cloves garlic, minced
• 1/2 large yellow onion, diced
• 1 tablespoon brown sugar
• 1 teaspoons salt, or to taste
• 1 teaspoon ground black pepper
• 1 pinch cayenne pepper
• 2 pounds boneless, skinless chicken thighs
• 3/4 cup ketchup
• 1 tablespoon Dijon mustard
• 1/2 teaspoon Worcestershire sauce (I used fish sauce instead)
• 1 tablespoon hot sauce
• 1 cup water
• 1 thinly sliced green onion
• 1/2 cup diced jalapeno pepper
• hamburger buns