Easy Kimchi (Mak Kimchi with Napa Cabbage)

Name: Easy Kimchi (Mak Kimchi with Napa Cabbage)
Prep time: 20 min
Total time: 20 min
Cuisine: Korean
Ingredients: 3 lb (1.3 kg) napa cabbage (about 1 medium head); 2/3 cup (200 g) Korean coarse sea salt; 1 bunch green onion (sliced); 2-3 fresh red chili (optional) (sliced ); 1/2 large onion (diced); 7-8 cloves garlic; 1 inch (2.5 cm) ginger (peeled and diced); 1/2 large sweet apple (seeded and diced); 2/3 cup (60 g) Korean chili flakes (gochugaru); 1 tbsp (12 g) sugar; 4 tbsp (60 ml) Korean anchovy sauce; 1 tbsp (15 ml) Korean salted shrimp; 3 tbsp (45 g) cooked white rice; 1/2 cup (120 ml) sea kelp stock (or water (See note))