Alpha Gal 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 any of the ingredients that make alpha-gal management tricky — it's built entirely around fish, vegetables, and pantry spices, with zero mammalian meat or hidden animal-derived additives to second-guess. Mackerel is the star here, a bold, meaty fish that holds up beautifully to a bright cilantro-lime marinade spiked with cumin, turmeric, and a pinch of red pepper flakes. The marinade gets pressed right into the flesh side of each fillet, so every bite is fragrant and deeply seasoned. Meanwhile, halved new potatoes and fennel wedges roast until golden and caramelized at the edges, soaking up the olive oil and spices in the best possible way. Everything comes together on a single pan, which means less cleanup and more time actually enjoying dinner. A squeeze of fresh lime and a scatter of feathery fennel fronds at the end keep things feeling fresh and a little restaurant-worthy. It's the kind of meal that looks impressive but asks very little of you.
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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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