Halibut With Rosemary with butter

6 each halibut portions halibut steaks or 1 2 lb. fillet * 3 tablespoons butter or margarine, cut up 3 tablespoons lemon juice Herb mix no. 1 1 teaspoon onion[...]

1 tablespoon extra virgin olive oil 1 large Spanish onion , chopped 1 large leek , white and tender green parts, halved lengthwise and sliced crosswise 1/4[...]