Cut coriander into 3cm(1inch) lengths. Set aside.
Cut green onion into 3cm(1inch) lengths.
Add green onion into a big bowl. Pour fish sauce over it. Turn it after 10 min. and let it brine for a total 20 min.
Cut red bell pepper and onion into big dices. Add them to the blender along with garlic, ginger, and water. Blend until smooth.
Pour it into a bowl and mix with gochugaru(Korean chili flakes) and stir well. The paste will thicken as gochugaru soaks the moisture.
Add coriander to the bowl in #3 along with brined green onion.
Pour the kimchi paste in and gently, but thoroughly mix well together. Toss them lightly.
Finish with toasted sesame seeds and give a final toss together.
Put them in a container, give a light push from the top to make sure there's no big space of air in between.
Serve it right away or ferment: let it sit at room temperature for half a day. When you start seeing some bubbles from the kimchi juice, store it in the fridge. Start serving the fermented kimchi and it keeps up to 2 weeks in the fridge before turning too sour.
For Avocado Bowl, slice the avocado. Fry an egg(I like mine sunny side up!).
Assemble on a bed of rice along with coriander kimchi. Splash some sesame oil. Serve right away.