Spicy Garlic Soy Baked Flounder

flounder in a foil pouch with spices and sauce and green onions

At Ajpal, I add lots of tips in all of my recipes – because I am a home cook without any formal training, and I find I am more confident making dishes when I understand why it works, and what each ingredient means to the flavor of a recipe. My goal is for even the most beginner home cook to feel empowered in the kitchen.

Foil Pouch BAked Flounder

I’m constantly looking for delicious, easy, and simple baked fish dishes that go beyond my standby baked fish with lemon and garlic.

It’s not that I don’t love that simple preparation- it is a classic- (this tweaked meyer lemon and lavender baked trout is to die for), but I love baking fish in foil pouches, and sometimes I’m looking for additional flavors!

This Spicy Garlic Soy Baked Flounder in a Foil Pouch recipe is a winner- it is SO simple, with easy ingredients, and is sure to delight even picky eaters!

(and don’t be afraid of the spice- that can easily be modified!!)

I love baking fish in the oven, mostly because it doesn’t take on any fishy flavor, and certainly doesn’t leave your house smelling like fish after cooking it.

It is foolproof, easy, and seriously – just getting rid of the fishy flavor and smell alone is totally worth baking fish most of the time! Plus, its an awesome way to add a ton of flavor without adding a ton of calories or fat to a nice and healthy, lean meat.

This baked flounder is so delicious- and the recipe is very easily modified to accommodate paleo and whole 30 diets!

This recipe is a nutritional powerhouse – there are under 155 calories per flounder filet, and very low carb and low fat – meaning you can pair it with a salad, rice, with vegetables, or even top a stir fry with it without breaking your diet.

How to Make Spicy Garlic Soy Flounder

First assemble these ingredients:

Flounder Filets (1 lb) – Mild and tender, these flounder filets serve as the perfect base for bold, aromatic flavors.
Soy Sauce (1 tbsp) – Adds deep umami richness and savory saltiness to the marinade.
Garlic Paste (2 tsp) – Delivers a concentrated punch of roasted garlic flavor throughout the dish.
Chili Paste (1 tsp) – Infuses the flounder with a fiery heat and subtle sweetness.
Rice Wine (1 tbsp) – Brightens the marinade with a hint of acidity and mild sweetness.
Cilantro Paste (1 tsp) – Brings a fresh, herbal note that balances the heat and salt.
Lemongrass Paste (1 tsp) – Adds citrusy, floral depth for a fragrant, Southeast Asian-inspired finish.

Tips and Tricks for Making Asian Baked Flounder

Don’t overbake – Flounder cooks quickly; bake at 375°F for 10–12 minutes or until the fish flakes easily with a fork. This is key!

Line your baking dish – Use parchment paper or foil to prevent sticking and make cleanup easier.

Use fresh flounder if possible – Fresh filets offer better texture and flavor than frozen ones; if using frozen, thaw completely and pat dry.

Broil for a minute at the end – A quick broil gives the top a slight char and intensifies the garlic and chili aroma.

If you stick to a paleo diet- never fear- simply swap the soy sauce for coconut aminos, and the mirin for a paleo-friendly vinegar!

Add a drizzle of sesame oil – A few drops before serving add a rich, nutty finish.

Garnish with fresh herbs – Chopped cilantro or green onions brighten the dish and enhance presentation.

Serve with neutral sides – Pair with steamed rice, soba noodles, or sautéed greens to soak up the bold sauce. This helps not detract from the flavor of the flounder.

Use a shallow dish – Ensures the marinade surrounds the fish evenly for consistent flavor.

My Pro Tip

Adjust the Heat

Use more or less chili paste depending on your heat preference. You can add more chili paste to individual pieces of fish to make sure everyone has the spice level they want.