Lemon-Dill Baked Fish Foil Packets

Description

Lemon-Dill Baked Fish Foil Packets are an easy, flavorful, and wholesome dinner made with tender white fish, baby potatoes, juicy cherry tomatoes, spinach, fresh dill, garlic, and bright lemon. Everything is wrapped together in foil, allowing the fish to bake gently while the ingredients absorb the delicious lemon-garlic butter juices. The result is moist, flaky fish with tender vegetables and plenty of fresh Mediterranean-inspired flavor.
This recipe is perfect for busy weeknights because the preparation is simple and cleanup is minimal. The individual foil packets also make serving easy, and each packet can be customized with your favorite vegetables or seasonings. For the best texture, partially cook the baby potatoes before assembling the packets because fish cooks much faster than whole potato halves.

Ingredients For the Foil Packets

2 large white fish fillets, about 150–200 g each
Cod, haddock, pollock, tilapia, or similar white fish
400–500 g baby potatoes, halved
1 cup cherry tomatoes, halved
2 cups fresh spinach
4 cloves garlic, finely minced
1 lemon, thinly sliced
2 tablespoons fresh dill, chopped
2 tablespoons olive oil
2 tablespoons unsalted butter, melted
1 tablespoon fresh lemon juice
1 teaspoon dried oregano
½ teaspoon paprika
½ teaspoon salt
¼ teaspoon black pepper
¼ teaspoon red pepper flakes, optional

For Garnishing

1 tablespoon fresh dill
Extra lemon wedges
Freshly cracked black pepper
A small drizzle of olive oil, optional

Step-by-Step Instructions

1. Prepare the potatoes: Wash the baby potatoes thoroughly and cut them in half. Because fish cooks quickly, the potatoes should be partially cooked before going into the foil packets. Place them in a saucepan of salted water and simmer for approximately 7–10 minutes, or until they are just beginning to become tender. Drain well and allow them to steam-dry for a few minutes.
2. Prepare the fish: Pat the fish fillets dry with paper towels. Removing excess moisture helps the seasoning stick and prevents the packets from becoming unnecessarily watery.
3. Make the lemon-dill mixture: In a small bowl, combine melted butter, olive oil, fresh lemon juice, minced garlic, oregano, paprika, salt, black pepper, and optional red pepper flakes. Stir until well combined.
4. Prepare the foil: Tear off two large sheets of heavy-duty aluminum foil. Place each sheet on a baking tray. For easier cleanup and extra protection, you can use a second layer of foil underneath each packet.
5. Add the vegetables: Divide the partially cooked potatoes between the two foil sheets. Add the spinach and cherry tomatoes around the potatoes. The spinach will shrink considerably during baking, so it is fine if the packets look generously filled at this stage.
6. Season the fish: Place one fish fillet over the vegetables in each packet. Spoon the lemon-garlic butter mixture evenly over the fish and vegetables.
7. Add lemon and dill: Place several thin lemon slices over each fish fillet and sprinkle generously with fresh dill. The lemon slices release their juice and aroma as the fish cooks.
8. Seal the packets: Bring the long sides of the foil together over the fish. Fold and crimp the edges securely, then fold the ends inward to create sealed packets. Leave a little room inside for steam to circulate rather than pressing the foil tightly against the fish.
9. Bake: Place the packets on a baking sheet and bake in a preheated 400°F (200°C) oven for approximately 15–20 minutes, depending on the thickness and type of fish. Very thick fillets may require a few additional minutes.
10. Check for doneness: Carefully open one packet because hot steam will escape. The fish should be opaque and flake easily with a fork. For food safety, fish should reach 145°F (63°C) internally.
11. Finish the packets: Once cooked, sprinkle the fish with additional fresh dill and freshly cracked black pepper. Add a squeeze of fresh lemon juice just before serving for an extra bright flavor.
12. Serve: Carefully transfer the fish and vegetables to plates, or serve directly in the opened foil packets. Spoon the flavorful lemon-garlic juices over the fish and potatoes.

Tips & Notes

Partially cook the potatoes first. This is one of the most important steps because raw potato halves generally need much longer to become tender than fish needs to cook.
Choose similar-sized fish fillets. Fillets with similar thickness will cook more evenly. If one piece is much thinner than the other, check it earlier.
Do not overcook the fish. White fish is naturally lean and can become dry if left in the oven too long. Start checking around 15 minutes.
Be careful when opening the foil. The packets contain very hot steam. Open them away from your face and hands.
Use fresh dill when possible. Fresh dill gives the recipe a bright, herbaceous flavor that pairs beautifully with lemon and fish. Dried dill can be substituted, but use a smaller amount.
Add more vegetables if desired. Thinly sliced zucchini, bell peppers, asparagus, mushrooms, or onions can be added. Avoid adding large pieces of raw vegetables that require significantly more cooking time.
For extra flavor, add a small pinch of smoked paprika or a little grated Parmesan before serving.
For a lighter version, reduce the butter and use extra olive oil. The fish will still stay flavorful because the sealed packet helps retain moisture.

Q&A

Can I use frozen fish?
Yes, but thaw the fish completely and pat it very dry before preparing the packets. Excess water can dilute the seasoning and cooking juices.
Can I use salmon instead of white fish?
Yes. Salmon works well with lemon, dill, garlic, and spinach. Cooking time may vary depending on the thickness of the salmon.
Do I have to use foil?
Foil is convenient for this recipe because it traps steam and keeps the fish moist. You can also use parchment packets if preferred.
Why are my potatoes still hard?
The potatoes may need more pre-cooking. Make sure they are partially tender before assembling the packets, especially if using larger baby potatoes.
Can I prepare the packets ahead of time?
You can assemble the packets several hours ahead and keep them refrigerated. For food safety, keep the raw fish refrigerated and bake the packets when ready to cook.
Can I add cheese?
Yes. A small amount of Parmesan or feta can be added after baking for extra flavor.
How do I know when the fish is ready?
The thickest part should reach 145°F (63°C) and the flesh should appear opaque and flake easily with a fork.

Servings

This recipe makes 2 generous servings, with one fish fillet and a portion of vegetables per person. It can easily be doubled for a family dinner or meal-prep situation.

Nutrition

Each serving contains approximately 430–500 calories, depending on the type of fish, amount of butter, and potato portion. It provides approximately 35–45 grams of protein, with carbohydrates primarily coming from the baby potatoes and vegetables. The fish provides high-quality protein, while spinach contributes folate, vitamin K, and other nutrients. Tomatoes provide additional vitamins and antioxidants, while olive oil supplies unsaturated fat. Nutrition values are estimates and can vary according to the exact fish, ingredient brands, portion sizes, and cooking method.