A simple, bright way to cook haddock fillets

Baked haddock with salsa verde is one of the fastest ways to turn a fresh fillet into dinner. The fish bakes in about 12 minutes at 400°F, and the salsa — made from parsley, capers, anchovies, garlic, and oil — takes another 5 minutes to blend. You end up with tender, flaky fish topped with a sharp, herbaceous sauce that tastes like it took far longer than it did.

The method works because haddock's mild, delicate flesh doesn't need much. The salsa verde does the seasoning work, and the oven's dry heat keeps the fillet moist if you don't overcook it. This is the kind of dish that tastes better when you use good fish and don't fuss with it.

Key Takeaways

  • Bake haddock fillets skin-side down at 400°F for 10 to 12 minutes, depending on thickness — the fish is done when it flakes easily at the thickest point.
  • Salsa verde is made by blending parsley, capers, anchovies, garlic, lemon juice, and olive oil — you can make it while the fish bakes.
  • Pat the fillets dry before baking so they brown lightly instead of steaming, and season them with salt and pepper only.
  • A 6-ounce fillet cooks faster and more evenly than a thick one, so ask your fishmonger to cut them to roughly the same size.

Preparing the haddock for the oven

Start with fillets that are roughly the same thickness — ideally between half an inch and three-quarters of an inch. If one fillet is much thicker than the others, it will still be raw when the thin ones are done. Pat them completely dry with paper towels; any moisture on the surface will turn to steam and prevent browning.

Lay the fillets skin-side down on a baking sheet lined with parchment paper or lightly oiled. Season with salt and pepper — nothing else yet. The salsa verde will carry all the flavor. If you want a little richness, brush the top of each fillet with a thin coat of olive oil, but it's not necessary.

Making the salsa verde while the fish bakes

Salsa verde is a loose, chunky sauce, not a smooth paste. Start with a large handful of fresh flat-leaf parsley — about 1 cup loosely packed. Roughly chop it and put it in a food processor or blender with 2 tablespoons of capers (rinsed if they're packed in salt), 2 anchovy fillets, 1 small clove of garlic (minced), the zest and juice of half a lemon, and 1/3 cup of good olive oil.

Pulse until the parsley is broken down but still has some texture — you want flecks of green, not a smooth purée. Taste it and adjust: more lemon juice if it needs brightness, more salt if it's flat, more capers if you want more bite. You can make this while the fish is in the oven, or up to a few hours ahead and keep it at room temperature.

Baking the fillets

Preheat your oven to 400°F. Once it reaches temperature, put the baking sheet in the middle rack and set a timer for 10 minutes. At 10 minutes, check the thickest part of the largest fillet by pressing it gently with a fork — if it flakes easily and is opaque all the way through, it's done. If it still looks translucent in the center, give it another minute or two.

Haddock cooks quickly because it's a lean, delicate fish. The moment it's opaque, take it out. Overcooked haddock becomes dry and loses its tender texture. If you're cooking for more than four people, bake in two batches rather than crowding the pan, which will cause the fillets to steam instead of bake.

Plating and serving

Transfer each fillet to a warm plate and spoon the salsa verde over the top, letting some pool on the plate around the fish. A squeeze of fresh lemon juice over everything is good, though the salsa already has lemon in it. Serve right away while the fish is still warm.

Salsa verde goes with almost any side: boiled potatoes, crusty bread to soak up the sauce, roasted vegetables, or a simple green salad. The sauce is bright enough that you don't need much else, but a wedge of lemon on the plate is always welcome.

Variations and substitutions

If you don't have anchovies, you can leave them out — the salsa will be less deep but still good. If you have fresh mint or basil, use half parsley and half of whichever herb you have. Some people add a tablespoon of red wine vinegar instead of lemon juice, which gives a different kind of sharpness.

You can also make salsa verde by hand: finely chop the parsley, capers, and garlic, then stir them together with the lemon juice and oil. It will be chunkier and take a bit longer, but the flavor is the same. If you're cooking for one or two, the recipe halves easily — just use a smaller fillet and scale back the salsa proportionally.

Frequently Asked Questions

Can I use frozen haddock for this recipe?

Yes, but thaw it completely first and pat it very dry — frozen fillets release more water as they thaw, and that moisture will prevent browning. Thaw in the refrigerator overnight rather than at room temperature, which keeps the texture firmer.

What if I don't have a food processor?

Finely chop the parsley, capers, garlic, and lemon zest by hand, then stir them together with the lemon juice and oil. It takes a few extra minutes but gives you more control over the texture, and many people prefer the chunkier result.

How do I know when the haddock is done without overcooking it?

Press the thickest part gently with a fork — if it flakes easily and is opaque all the way through, it's done. If you're unsure, take it out a minute early; it will keep cooking slightly from residual heat. Overcooked haddock is harder to fix than undercooked.

Can I make the salsa verde ahead of time?

Yes, make it up to a few hours ahead and keep it at room temperature. If you make it more than a few hours ahead, the parsley will darken and the flavor will flatten slightly, so it's best fresh or within a few hours of blending.