In a large bowl add the gochujang, gochugaru, garlic, sugar, soy sauce, vinegar, sesame oil and sesame seeds. Mix until combined.
1 tbsp Korean hot pepper paste / gochujang, ½ tbsp Korean hot pepper flakes / gochugaru, 2 tsp garlic, 1 tbsp sugar, 1 tbsp soy sauce, ½ tbsp vinegar, ½ tbsp sesame oil, 1 tbsp sesame seeds