Fillet of Fish a L'Orange

Flounder fillets bake on a bed of sliced mushrooms and green onions, bathed in a sauce of white wine, fresh orange juice, and curacao liqueur. The orange and curacao combination gives this dish its “a l’orange” character, but it’s subtle, not overpowering. The citrus brightens the mild flounder while the wine and mushrooms add savory depth.

Layering matters here. Half the onions and mushrooms go under the fish, half on top. This sandwiches the fillets between vegetables so they steam gently and stay moist during the 40-minute bake. The covered dish traps moisture and creates a fragrant broth that doubles as your serving sauce.

A touch of soy sauce in the braising liquid might seem odd in a French-style fish dish, but it adds a quiet umami backbone that rounds out the citrus and wine. You won’t taste “soy sauce," just a fuller, more satisfying flavor.

Chef Tips

• Use fresh flounder or sole fillets. Frozen fillets release too much water and dilute the sauce.
• Don’t peek during baking. Every time you lift the cover, you lose steam and extend the cooking time.
• The fish is done when it turns from translucent to fully opaque and flakes easily with a fork.

Variations

• Substitute sole, tilapia, or cod if flounder isn’t available. Any mild white fish works well.
• Replace curacao with Grand Marnier or triple sec for a slightly different citrus note.
• Skip the wine and add extra orange juice with a squeeze of lemon for an alcohol-free version.