Grilled Brassicas with Mixed Grains and Bonito Broth

Name: Grilled Brassicas with Mixed Grains and Bonito Broth
Ingredients: 1/3 cup farro; 1/3 cup pearled barley; 1/3 cup wild rice; One 1/2-ounce piece of dried kombu (see Note); One 5-gram package dried bonito flakes (see Note); 1/2 pound Broccolini or baby broccoli, stems peeled; 4 large brussels sprouts, quartered; 4 large cauliflower florets, quartered; Extra-virgin olive oil, for drizzling; Salt and freshly ground pepper; 1 tablespoon soy sauce, preferably white soy (see Note); 4 tablespoons cold unsalted butter, cut into tablespoons; 2 tablespoons plus 2 teaspoons fresh lemon juice (preferably Meyer lemon); 4 poached quail eggs (see Note)