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Keto Dinner

Mainely Fish

Whenever I need a simple, no-fuss keto dinner, this Mainely Fish recipe comes to mind. Tender haddock fillets bake gently in foil packets with colorful bell peppers, tomatoes, and briny capers, creating a light yet satisfying meal. It’s one of those dishes I turn to when I want something healthy on the table with minimal cleanup.

15 min Prep time 20 min Cook time 35 min Total time 6 Servings 240 Calories
Mainely Fish

Ingredients

  • haddock fillets (3 oz each)
  • salt and pepper to taste
  • roma tomatoes, thinly sliced
  • red bell pepper, thinly sliced
  • yellow bell pepper, thinly sliced
  • small onion, thinly sliced
  • tablespoons capers
  • tablespoons fresh parsley, chopped
  • tablespoons fresh lemon juice
  • tablespoons extra virgin olive oil

Instructions

  1. Step 1

    First, I preheat the oven to 400°F. While it warms, I prepare six large squares of aluminum foil. Place one haddock fillet in the center of each. Season with a pinch of salt and pepper. Then, artfully arrange the thinly sliced tomatoes, onion, and mixed bell peppers right on top of the fish. Evenly scatter the capers and fresh parsley over each pile. Now, drizzle one tablespoon of olive oil and one tablespoon of lemon juice over each fillet—this locks in moisture and flavor. Carefully fold the foil over the ingredients, sealing the edges tightly to create a packet, and set them on a baking sheet with a couple inches between each. Once the oven is hot, bake the packets for 20 minutes. Let them rest for about 5 minutes before opening

  2. Step 2

    the steam inside will be intense, so be cautious. Unwrap and serve each fragrant packet at the table for a rustic, individual meal.

Chef's Tip

I always add a few thin slices of lemon on top of the fish before sealing the foil. It infuses a subtle citrus note as it bakes. If you’re using frozen haddock, thaw it completely and pat dry to avoid excess liquid in the packet.

Storage Tips

Store any leftovers in an airtight container in the fridge for up to 2 days. To reheat, gently warm in a 350°F oven or microwave until just heated through to keep the fish tender.

Variation Tips

For a spicier kick, add a pinch of red pepper flakes to each packet. You can also swap haddock for cod or salmon, and use whatever colorful veggies you have on hand, like zucchini or asparagus.

Frequently Asked Questions