Build the sauce: Once the porridge is cool add gochugaru — start with 1 cup and adjust based on the color and taste. Then add minced garlic, grated onion, grated ginger, anchovy fish sauce, Korean fish sauce, and sugar. Add the green onion pieces and mix everything together well. Taste and adjust — more sugar if you want it slightly sweeter, more fish sauce if you want more depth, more gochugaru if you want more heat and color.