Brussels Sprout Kimchi

Name: Brussels Sprout Kimchi
Ingredients: 3.5 ounces plus .7 ounces kosher salt; 1 1/2 pounds small brussels sprouts, trimmed, halved; 1/2 small onion, coarsely chopped; 2 scallions, sliced; 4 garlic cloves; 1/4 cup gochugaru (coarse Korean red pepper powder); 2 tablespoons fish sauce (such as nam pla or nuoc nam); 2 tablespoons Sriracha; 1 tablespoon grated peeled ginger; 1 tablespoon soy sauce; 2 teaspoons coriander seeds, crushed; 2 teaspoons fennel seeds, crushed; Ingredient info: Gochugaru can be found at Korean markets.