Halibut without bulbs mirin onion

1 tablespoon butter 2 tablespoons flour 3/4 cup coarsely chopped tomatillos (see Notes) 1/2 cup coarsely chopped onion 2 fresh poblano chiles (6 oz. total),[...]

3 tablespoons extra-virgin olive oil, divided 4 (6-ounce) halibut fillets 1/2 teaspoon kosher salt, divided 1/2 teaspoon freshly ground black pepper, divided[...]

1/4 cup olive oil 1 tablespoon coarsely chopped fresh rosemary 1 teaspoon salt 1 teaspoon freshly ground black pepper 1 1/2 pounds boned and skinned halibut,[...]