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Keto Dinner

Easy Mediterranean Fish

I often turn to this effortless Mediterranean halibut when I want a no-fuss keto dinner. The fish steams gently inside a foil packet, soaking up briny olives, capers, and fresh tomato. With just a few pantry staples, you get tender, flaky fish infused with Greek seasoning. It’s a vibrant, low-carb meal that feels special but comes together in minutes. Ready in under an hour, it's become a weeknight staple.

15 min Prep time 35 min Cook time 50 min Total time 4 Servings 350 Calories
Easy Mediterranean Fish

Ingredients

  • (6 ounce) halibut fillets
  • tablespoon Greek seasoning (such as Cavender's®)
  • large tomato, chopped
  • onion, chopped
  • (5 ounce) jar pitted kalamata olives
  • /4 cup capers
  • /4 cup olive oil
  • tablespoon lemon juice
  • salt and pepper to taste

Instructions

  1. Step 1

    Preheat your oven to 350°F. Lay out a large sheet of aluminum foil and place the halibut fillets in the center. Pat them dry so the seasoning sticks better. Sprinkle the Greek seasoning evenly over the fish. In a mixing bowl, toss together the chopped tomato, onion, drained olives, capers, olive oil, and lemon juice. Add a pinch of salt and a few grinds of pepper, then spoon this vibrant mixture over the fillets. Piling it high lets those flavors seep deep into the fish. Carefully fold the foil edges together and crimp them tightly to create a sealed packet—you want no steam to escape. Set the packet on a baking sheet and slide it into the oven. Bake for 30 to 40 minutes, or until the fish is opaque and flakes easily with a fork. The exact time depends on thickness, so check at the 30-minute mark to avoid overcooking. When it’s done, carefully open the packet—watch for the burst of aromatic steam—and serve directly from the foil for easy cleanup.

Chef's Tip

My trick for extra flavor is to add a pinch of red pepper flakes to the tomato mixture. I also like to let the assembled packet rest for 10 minutes before baking, which helps the seasoning really penetrate the halibut and infuse every bite.

Storage Tips

Leftovers keep well in an airtight container in the fridge for up to 2 days. To reheat, gently warm in a skillet over low heat or flake it cold over a crisp green salad for a quick lunch. Avoid microwaving, as it can make the fish rubbery.

Variation Tips

Feel free to swap halibut with cod, salmon, or even chicken thighs for a different protein. For a complete keto plate, pair it with cauliflower rice or a lemony arugula salad. Tossing sliced zucchini or bell peppers into the packet also adds extra veggies and soaks up the savory juices.

Frequently Asked Questions