Baked Mackerel with Cucumber & Radish Salad in Apple Cider Vinegar (Vinegar supports insulin sensitivity)
By the QuiteRecipes team (Jamy & Kaïna) | Food Service Professional, Early Childhood Expert & Parents
Oven-baked mackerel over a crisp cucumber-radish salad in apple cider vinegar — omega-3s plus vinegar's gentle nudge to insulin sensitivity.
Mackerel is one of the most omega-3-dense fish at the counter, and it earns its place on a PCOS plate without trying. Baked simply and served over a cool, snappy cucumber-radish salad, the dish gets an extra layer of clever from the apple cider vinegar dressing — acidic dressings are a gentle, evidence-backed way to slow the rise of blood sugar alongside a meal.
🥄 Ingredients
- 🫗 2 mackerel fillets (about 150g / 5 oz each), bones removed
- 🫗 1 cucumber (250g), thinly sliced
- 🫗 1 bunch radishes (150g), thinly sliced
- 🫗 3 tablespoons apple cider vinegar
- 🫗 2 tablespoons olive oil, divided
- 🫗 1 teaspoon Dijon mustard
- 🫗 1 small bunch fresh dill, chopped
- 🫗 Black pepper and a light pinch of salt
Nutrition Facts*
*Nutritional information is an estimate and may vary based on ingredients, brands and portion sizes. Values are provided per serving.
👨🍳 Instructions
Preheat the oven to 400°F (200°C). Rub the mackerel fillets with 1 tablespoon olive oil and black pepper and lay them skin-side up on a lined baking tray.
Bake for 12–15 minutes until the flesh is opaque and flakes easily with a fork.
Meanwhile, whisk the apple cider vinegar, remaining olive oil, Dijon mustard, and most of the dill with a light pinch of salt.
Toss the cucumber and radish slices in the dressing and rest for 10 minutes so they mellow and soften slightly.
Serve the hot mackerel with the cucumber-radish salad, scattered with the remaining dill.
⚠️ Common Mistakes
- ✕
Overbaking mackerel until dry; check it at 12 minutes, as it's a fast fish.
- ✕
Soaking the salad for hours, which wilts the cucumber into mush — 10 minutes is plenty.
- ✕
Reusing the tray without oil, so the skin sticks and tears when you lift it.
🔄 Variations
Swap mackerel for herring or sardine fillets with nearly identical benefits.
Add a handful of frisée or watercress to the salad for peppery depth.
Use white wine vinegar if apple cider's fruitiness isn't your thing.
🧊 Storage
- 📦
Cooked mackerel keeps 2 days and is superb flaked cold into the next day's salad.
- 📦
The dressed salad keeps a day in the fridge but is freshest within the hour.
💡 Chef Tips
Tip 1: Mackerel is naturally salty and rich, so keep the added salt to a light pinch and lean on pepper, dill, and vinegar.
Tip 2: Resting the salad in the vinegar for 10 minutes turns crunchy vegetables gently pickled.
Tip 3: Serve the fish warm over the cold salad — the contrast is the whole point.
Tip 4: Bake with the skin up so it turns bronzed while the flesh stays tender.
❓ FAQ
Q
Does vinegar really help with blood sugar? Studies suggest a tablespoon or two of vinegar with a meal can modestly blunt the post-meal glucose rise — a nice, low-cost habit.
Q
How much mackerel should I eat? A 150g portion is a sensible serving of oily fish; aim for two such portions a week.
Q
Is mackerel too high in mercury? No — mackerel like Atlantic mackerel is a smaller fish and low in mercury; just avoid giant king mackerel.
🔗 Related Recipes
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 →