Sandra This creamy, savory Alton Brown Baked Flounder is made with delicate fish fillets, a spinach filling, and a rich cheddar sauce, ready in just over an hour. The hero moment arrives when you pull the bubbling, golden casserole from the oven, filling the kitchen with the scent of wine and melted cheese. I love how this recipe proves that seafood and cheese can actually be best friends.
Why This Recipe Works
I used to believe the old culinary rule that cheese and fish should never meet, but this dish completely changed my mind. The sharpness of the cheddar cuts through the mild sweetness of the flounder, while the white wine adds just enough acidity to keep the heavy cream from feeling too rich.
One surprise during my first attempt was how essential it is to squeeze the spinach completely dry. If you skip this step, the filling releases too much water into the sauce, turning your comforting casserole into a soupy mess.
Alton Brown Baked Flounder Ingredients
For the Spinach Filling:
-
- 2 tbsp unsalted butter
- 1 medium onion, chopped
- 1/2 medium shallot, minced
- 10 oz frozen chopped spinach, thawed and squeezed dry
- 1 lemon, zested
- 2 tbsp fresh parsley, chopped
- 1 tsp kosher salt
- 1 tsp black pepper
For the Cheese Sauce:
-
- 1 cup heavy cream
- 1/4 cup white wine
- 1 tbsp lemon juice
- 10 oz cheddar cheese, grated
For Assembly:
- 1 1/2 to 2 lbs flounder fillets
- 2 cups cooked long grain white rice
How To Make Alton Brown Baked Flounder
- Prepare the Filling: Melt the butter in a skillet over low heat. Add the chopped onion and a pinch of salt, sweating until translucent. Add the shallot, spinach, and lemon zest. Cook until just heated through, then stir in the parsley, salt, and pepper. Remove from heat.
- Make the Cheese Sauce: In a medium saucepan, bring the heavy cream, white wine, and lemon juice to a simmer. Gradually whisk in the grated cheddar cheese until the sauce is smooth and the cheese is fully melted. Keep warm.
- Roll the Fish: Season the flounder fillets on both sides with salt and pepper. Place a portion of the spinach mixture onto each fillet and roll the fish tightly around the filling.
- Assemble and Bake: Preheat your oven to 350°F. Spread the cooked rice evenly in the bottom of a casserole dish. Place the fish rolls on top of the rice, seam-side down. Pour the warm cheese sauce over the fish and bake for 25 minutes until bubbly. Let cool for 5 minutes before serving.
Recipe Tips
- Dry the spinach thoroughly: Squeeze the thawed spinach in a clean kitchen towel until absolutely no more water comes out to prevent a watery sauce.
- Grate your own cheese: Pre-shredded cheese contains anti-caking agents that can make your sauce grainy; buy a block of cheddar and grate it yourself.
- Don’t overcook: Flounder is very delicate and dries out easily, so remove the dish from the oven as soon as the sauce is bubbling and the fish is opaque.
What To Serve With Baked Flounder
Crisp green vegetables like roasted asparagus or steamed broccoli are essential to balance the rich cheese sauce. A bright arugula salad with a sharp lemon vinaigrette also works well to cut through the heaviness of the cream and cleanse the palate.
How To Store
Store leftovers in an airtight container in the refrigerator for up to 2 days. Reheat gently in the oven to prevent the sauce from separating; freezing is not recommended as the cream sauce will likely split when thawed.
FAQs
Can I use fresh spinach instead of frozen? Yes, but you must cook it down first. You will need about 1 pound of fresh spinach to equal the amount of frozen spinach once wilted and squeezed dry.
What if I can’t find flounder? Sole is the best substitute as it has a similar texture and thinness. Thin tilapia fillets can also work if you pound them slightly so they roll easily.
Is the rice necessary? The rice isn’t strictly required for the fish to cook, but it acts as a delicious bed that soaks up the excess cheese sauce, making the dish a complete meal.
Nutrition
- Calories: 650
- Total Fat: 45g
- Saturated Fat: 25g
- Cholesterol: 150mg
- Sodium: 900mg
- Total Carbohydrate: 25g
- Protein: 35g
Try More Recipes:
Alton Brown Baked Flounder Recipe
Description
A technically layered dish featuring delicate flounder fillets rolled with an aromatic spinach filling. The recipe utilizes a reduced-cream cheese sauce and a base layer of rice to capture the flavorful runoff from the fish during the baking process.
Ingredients
For the Spinach Filling:
For the Cheese Sauce:
For Assembly:
Instructions
- The Aromatic Sweat: Melt butter in a skillet over low heat. Add the onion and a pinch of salt. Sweat the onions until translucent. Low heat is essential here to soften the cellular structure without triggering the Maillard reaction (browning), which would overwhelm the delicate fish.
- Spinach Integration: Add the shallot, pre-squeezed spinach, and lemon zest. Heat through just until the flavors meld. Stir in the parsley, salt, and pepper off-heat to preserve the volatile oils in the herbs.
- The Sauce Reduction: In a saucepan, simmer the heavy cream, white wine, and lemon juice. The alcohol in the wine and the acid in the lemon juice help to “cut” the fat of the cream.
- Emulsification: Gradually whisk in the grated cheddar. Adding the cheese slowly prevents the sauce from breaking or becoming “stringy.” Keep the sauce warm but do not boil after the cheese is added.
- The Paupiette (The Roll): Season the flounder fillets. Place a portion of the spinach mixture on the wide end of each fillet and roll tightly toward the tail. This protects the delicate meat and ensures the filling stays moist.
- Thermal Buffer Assembly: Spread the cooked rice in a casserole dish. This rice acts as a “sponge” for the juices released by the fish and the sauce.
- Bake: Arrange the fish rolls on the rice, seam-side down to prevent unrolling. Pour the cheese sauce over the top. Bake at 350°F for 25 minutes until the fish reaches an internal temperature of 145°F.
- Rest: Allow the dish to sit for 5 minutes. This allows the sauce to thicken slightly and the proteins in the fish to relax.
