Steamed Fish with sprigs

1 tablespoon Dijon mustard 1/3 cup olive oil 2 tablespoons finely chopped scallions 2 tablespoons freshly chopped coriander 1 pinch hot red pepper flakes[...]

1 pound halibut fillet 1 teaspoon coarse sea salt or kosher salt 1 tablespoon minced fresh ginger 3 tablespoons thinly sliced green onion 1 tablespoon dark[...]