In a small saucepan, combine the glutinous rice flour, sugar, and 2 cups of water. Whisk constantly over medium heat until it thickens, about 3 minutes. Remove from the heat and let the mixture cool to body temperature. Try to keep it below 110°F.
In a food processor, blend the apple, onions, garlic, ginger, salted shrimp, and fish sauce into a puree.
Now combine the rice mixture, garlic mixture, gochugaru, scallions, and daikon in a medium bowl. Mix until combined.
Add the napa cabbage and toss until evenly coated.
Transfer the kimchi to two large mason jars. Add the lids on loosely and let them ferment at room temperature for 1-7 days. Make sure to "burp" the jars every 12-24 hours to prevent pressure from building up. Taste a piece of kimchi every day, and when the sourness reaches your liking, transfer the kimchi to your fridge. You can store it for up to several months.