Prepare the ingredients: Wash the green onions. Gather the rice flour, sugar, water, fish sauce, sesame seed oil and soy sauce.
Make the roux: Prepare a pot without preheating and add the rice flour and water. Adjust the temperature to the lowest heat and begin whisking the ingredients together. Continuously whisk until the roux begins to bubble. Turn off the heat once the bubbling starts.
Make the chili paste: Add the sugar, gochugaru, soy sauce, and sesame seed oil to the roux and stir to combine the ingredients. Allow the chili paste to cool to room temperature.
Mix everything: Add the spring onion and gently stir everything together once the chili paste has cooled down. Garnish with sesame seed oil and serve.