Pan-Seared Mackerel with Fennel and Apple Cider Vinegar Slaw
By the QuiteRecipes team (Jamy & Kaïna) | Food Service Professional, Early Childhood Expert & Parents
Mackerel is one of the densest omega-3 sources left — pan-seared crispy, over a raw fennel slaw sharpened with apple cider vinegar and caraway seeds.
Mackerel is the humble omega-3 all-star: oily, quick-cooking, cheaper than salmon, and crisp in a hot pan in minutes. Serve it over raw fennel shaved thin, sharpened with apple cider vinegar and caraway seeds. A weeknight plate that feels French, comes together in twenty-five minutes, and quietly checks a lot of good-health boxes.
🥄 Ingredients
- 🫗 2 mackerel fillets (about 300g total)
- 🫗 1 large fennel bulb, shaved paper-thin
- 🫗 2 tablespoons apple cider vinegar
- 🫗 3 tablespoons extra virgin olive oil
- 🫗 1 teaspoon caraway seeds
- 🫗 1/2 teaspoon Dijon mustard
- 🫗 Salt and black pepper
- 🫗 1 tablespoon fresh dill, chopped
- 🫗 Lemon wedges, to serve
Nutrition Facts*
*Nutritional information is an estimate and may vary based on ingredients, brands and portion sizes. Values are provided per serving.
👨🍳 Instructions
Toss the shaved fennel with the apple cider vinegar, half the olive oil, the caraway seeds, salt, and pepper. Set aside to soften for 10 minutes.
Pat the mackerel fillets very dry; score the skin lightly in three places.
Heat the remaining olive oil in a skillet over medium-high. Lay the fillets skin-side down and press gently — cook 3–4 minutes until the skin is crisp, then flip for 1 minute only.
Whisk the Dijon into the slaw with the dill, taste, and pile onto plates.
Set the fish crisp-side up over the slaw and serve with lemon wedges.
⚠️ Common Mistakes
- ✕
Flipping the fillet with impatience — the skin releases from the pan when it's truly crisp, not before.
- ✕
Overdoing the vinegar — it should sharpen the fennel, not pickle your palate.
- ✕
Cooking both fillets in a crowded pan that steams instead of sears.
🔄 Variations
Swap the Dijon for a spoon of yogurt for a creamier slaw.
Use sardines or sardines-style tinned fish crushed over toast when you're short on time.
Add a handful of watercress to the slaw for nitrate-rich greens.
Substitute dill with tarragon — both play beautifully with fennel.
🧊 Storage
- 📦
Mackerel is a same-day fish; enjoy the fillets within hours.
- 📦
The slaw actually gets better after a few hours in the fridge — you can make it a day ahead.
💡 Chef Tips
Tip 1: Dry skin is the difference between crisp and steamed — pat the fillets with paper towel like your life depends on it.
Tip 2: Score the skin once or twice, across, so it stays flat instead of curling into a cup.
Tip 3: Ask the fishmonger to French-cut (skin-on, frames removed) if buying whole fish, and use any trimmings for the bone broth recipe on this site.
❓ FAQ
Q
How does mackerel compare to salmon for omega-3s? Serving for serving, mackerel is often higher in omega-3s than salmon — and cheaper, especially tinned, which is sardine-adjacent in convenience.
Q
Why apple cider vinegar in the slaw? Beyond flavor, ACV has a long folk tradition as a digestion and circulation stimulant; here it keeps the fennel crisp and bright.
Q
Is eating oily fish twice a week the actual guideline? Yes — two portions of oily fish a week is the classic public-health target, and this plate easily covers one in a single sitting.
Q
Can I eat the skin? It's the best part — crisp, rich, and holding half the flavor. Eat it proudly.
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About the Authors
This recipe and guide was developed, tested, and approved in our home kitchen and daily life. Jamy is a retired Food Service District Manager and Early Childhood Program Manager who spent his career overseeing multi-site restaurant operations, large-scale culinary production, and daycare menu management. Kaïna brings the ultimate real-world test: making sure it brings ease and joy to our kids on a busy weeknight.
Read more about our professional background and philosophy →