4  halibut steaks, fresh or thawed frozen (about 2 pounds) 1/4 cup butter, melted 2  tablespoons olive oil 1  tablespoon wine vinegar 2  teaspoons lemon juice 1  clove garlic, minced 1/4 teaspoon dry mustard 1/4 teaspoon marjoram 1/2 teaspoon salt 1/8 teaspoon ground black pepper 2  large zucchini 1  package (10 ounces) frozen green peas [...]