Mother-in-Law's Signature Kimchi from 'The Kimchi Cookbook'

INGREDIENTS

• 2 medium heads (4 to 5 pounds total) napa cabbage
• 2 tablespoons kosher salt
•  
• 2 tablespoons salted shrimp
• 1/3 cup
• 1/4 cup anchovy sauce
• 1/4 cup beef stock
• 2 tablespoons minced garlic
• 1 tablespoon peeled, finely grated fresh ginger
• 2 teaspoons sugar
• 2/3 cup Korean chile pepper flakes
• 1/2 cup thinly sliced yellow onion
• 4 green onions, green parts only, cut into 2-inch pieces (about 1/2 cup)
• 3 ounces Korean chives or 1/2 bunch European chives, cut into 4-inch pieces (about 1/4 cup)
• 6 to 8 fresh oysters (optional)