Gochugaru Spare Ribs with East Meets West Barbecue Sauce

Ingredients

• 3 racks St. Louis-style spare ribs or baby back ribs
• 3 teaspoons toasted sesame oil
• Toasted sesame seeds, for garnish
• 3 tablespoons brown sugar
• 2 tablespoons kosher salt
• 2 tablespoons gochugaru (Korean dried pepper)
• 2 teaspoons garlic powder
• 1 teaspoon ground ginger
• 1 teaspoon ground black pepper
• 1 (340g) bottle chili sauce
• 1 (230g) can tomato sauce
• 1/3 cup honey
• 1/4 cup soy sauce
• 4 tablespoons melted unsalted butter
• 2 tablespoons Worcestershire sauce
• 2 tablespoons unseasoned rice vinegar
• 1 tablespoon toasted sesame oil
• 4 cloves garlic, chopped
• 3 scallions, sliced
• 1 tablespoon grated fresh ginger
• 1 to 2 tablespoons gochugaru (Korean dried pepper)