Add cooled rice slurry, garlic, ginger, onion, apple into a blender and blend into a paste. Transfer to a bowl.
Add julienned carrot, radish, chopped green onions into the slurry.
Add gochugaru or coarsely powdered dry red chillies, salt, sugar. Mix well.
Add well drained napa cabbage into kimchi paste and mix well.
Fill kimchi in airtight containers.
Press down as much as possible to remove air pockets. Let the veggies be submerged in kimchi paste.
Do not fill containers to the brim. Leave 2 inches of space at the top for fermentation.