I mostly just salt & pepper mine and roast at a high heat until it flakes. The key for me is serving it with this:
Piquant Dill Sauce:
2 tablespoons butter
2 leeks, white part only, finely chopped, then thoroughly washed
1 jalapeno chile, seeds and membranes removed, finely diced
2 garlic cloves, minced
1 cup vegetable or chicken stock
1 1/2 cups lightly packed fresh dill, stems removed before measuring
2 tablespoons freshly squeezed lemon juice
1/4 teaspoon salt
1/2 teaspoon freshly ground black pepper
1/4 cup sour cream
Melt the butter over medium heat in a saute pan. Add the leek, jalapeno, and garlic and saute until the leeks are translucent but not brown, about 5 minutes. Reduce heat to medium and add the stock. Simmer, uncovered, for 15 minutes. (Adjust heat as required to maintain simmer.) The liquid should reduce by half. Remove from heat and let cool.
Transfer to a blender or food processor and add the dill, lemon juice, salt, and pepper. Puree until smooth. Reserve and reheat just before serving. Stir in the sour cream at the last minute.
I usually make a big batch of this and leave out the sour cream, freeze it in ice cube trays and then defrost 1 cube per serving when I'm ready to use it and add the sour cream. It's divine!