Bakso Daging cincang

Bahan-bahan (28 porsi)

• 1 small diced onion
• 2 cloves minced garlic
• 1 tablespoon unsalted butter
• 1 ⅓ pounds ground beef
• 1 large egg
• ½ cup panko bread crumbs
• ½ cup milk
• 1 tablespoon Worcestershire sauce
• ½ teaspoon thyme
• 1 teaspoon kosher salt
• ¾ cup ketchup
• 1 ½ tablespoons brown sugar
• 1 ½ tablespoons spicy brown mustard