Gut Friendly Cilantro-Lime Mackerel with Fennel & New Potatoes Sheet Pan Dinner
Sheet pan dinners are a weeknight lifesaver, and this one delivers serious flavor without a pile of dishes to clean up afterward. Mackerel is one of the most gut-supportive fish you can cook with — rich in omega-3 fatty acids that help calm inflammation and feed a healthy microbiome — and it pairs beautifully here with roasted fennel, a prebiotic vegetable known for supporting digestive balance. The new potatoes roast until golden and tender, while the fennel softens and caramelizes at the edges, creating a naturally sweet, savory base for the fish. A bright marinade of fresh cilantro, lime juice, garlic, cumin, and turmeric does double duty: it keeps the mackerel moist during roasting and layers in anti-inflammatory spices that make every bite feel intentional. Turmeric and cumin in particular have long been recognized for their digestive-friendly properties, so this isn't just a delicious dinner — it's one that works with your body. Everything comes together on a single pan in under an hour, making it as practical as it is nourishing. Finish with a squeeze of fresh lime and a scatter of feathery fennel fronds for a plate that looks and tastes far more impressive than the effort involved.
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Learn more →Ingredients
4 servings
For the sheet pan
- 1 ½ lb new potatoes, halved
- 1 large fennel bulb, cored and cut into ¾-inch wedges, fronds reserved
- 3 tbsp extra-virgin olive oil, divided
- ¾ tsp fine sea salt, divided
- ½ tsp black pepper, divided
For the marinade
- ¼ cup fresh cilantro leaves and tender stems, finely chopped
- 2 tbsp fresh lime juice (from about 2 limes)
- 1 tsp lime zest
- 2 garlic cloves, finely minced
- 1 tsp ground cumin
- ½ tsp ground turmeric
- ¼ tsp red pepper flakes
For the fish
- 4 mackerel fillets (about 5–6 oz each), skin-on, pin bones removed
For serving
- lime wedges, for serving
- reserved fennel fronds, roughly chopped, for serving (optional)
Instructions
- 1
Position a rack in the center of the oven and preheat to 425°F (220°C). Line an 18×13-inch rimmed sheet pan with parchment paper or foil.
- 2
Toss the halved new potatoes and fennel wedges on the prepared sheet pan with 2 tablespoons of the olive oil, 1/2 teaspoon of the salt, and 1/4 teaspoon of the black pepper until evenly coated. Spread in a single layer, cut sides down. Roast for 20 minutes, until the potatoes are just beginning to turn golden at the edges and the fennel is softened.
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