Sole and Mushroom Casserole

Notes: Bake the sole while the potatoes cook; keep it warm for a few minutes while you mash the potatoes and make the sauce.

Yield: Makes 4 servings
Recipe from Sunset

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Nutritional Information

Amount per serving
  • Calories: 354
  • Calories from fat: 12%
  • Protein: 39g
  • Fat: 4.7g
  • Saturated fat: 2g
  • Carbohydrate: 40g
  • Fiber: 4.4g
  • Sodium: 673mg
  • Cholesterol: 63mg


  • Mushroom Essence
  • 1 pound boned, skinned sole fillets, rinsed
  • 3/4 cup chopped green onions
  • 2 tablespoons drained capers
  • 2 tablespoons cream sherry
  • 1 tablespoon soy sauce
  • 1 teaspoon minced peeled fresh ginger
  • 1 1/2 pounds thin-skinned potatoes, rinsed, peeled, and cut into 1/2-inch cubes
  • 1/2 teaspoon dried tarragon
  • 2 teaspoons cornstarch
  • About 1/2 cup low-fat (1%) milk
  • 1/4 cup shredded gruyère or Swiss cheese
  • Salt and pepper


  1. 1. Pour one recipe's worth of Mushroom Essence through a fine strainer into a 4- to 5-quart pan; discard the ginger. Put mushrooms in a shallow 10- to 11-inch oval casserole (about 2 1/2 qt.). Add 1/2 cup green onions, capers, sherry, soy sauce, and ginger to mushrooms; mix and spread level. Lay sole fillets evenly over mixture, overlapping if necessary. Cover casserole tightly with foil.
  2. 2. Bake sole in a 375º oven until fillets are opaque but still moist-looking in center of thickest part, about 15 minutes.
  3. 3. While sole bakes, add potatoes and tarragon to mushroom broth. Bring to a boil over high heat; cover and simmer until potatoes are soft enough to mash easily, about 15 minutes. Drain potatoes in a strainer over a bowl. Pour liquid back into pan and put potatoes in the bowl.
  4. 4. Uncover sole and drain juices into pan. Boil liquid over high heat until reduced to about 3/4 cup, 4 to 5 minutes. In a small bowl, blend cornstarch with 1 tablespoon water and stir into boiling liquid; stir until boiling again, and remove from heat. Turn oven to broil.
  5. 5. Meanwhile, with a potato masher or a mixer, mash potatoes until smooth, adding enough milk for desired texture. Push sole and mushrooms toward center of casserole to leave a 1-inch space around the edge. Spoon potatoes (or pipe through a pastry bag with a large plain or star tip) into space. Pour sauce over sole mixture. Sprinkle potatoes with cheese.
  6. 6. Broil about 4 inches from heat until cheese is very lightly browned, about 4 minutes. Sprinkle with remaining 1/4 cup green onions. Add salt and pepper to taste.
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