Barley Free Cilantro-Lime Mackerel with Fennel & New Potatoes Sheet Pan Dinner
Sheet pan dinners don't get much more vibrant than this one — bold, citrusy marinade meets tender roasted vegetables and rich, flaky fish all on a single pan. Mackerel is an underrated weeknight hero, and here it gets a punchy coating of fresh cilantro, lime juice and zest, garlic, cumin, and turmeric that perfumes the whole kitchen as it roasts. The new potatoes go in first, cut-side down so they develop golden edges, while the fennel wedges soften and caramelize alongside them before the fish even hits the pan. Every ingredient in this recipe is naturally free of barley and grain-based additives, so there's no label-scanning or substitution stress — just whole, straightforward produce, olive oil, and spices. Pushing the vegetables to the edges and nestling the marinated fillets into the center means everything finishes together in one cohesive, restaurant-worthy result. A squeeze of fresh lime and a scatter of feathery fennel fronds over the top pull the whole dish together beautifully. It's the kind of meal that looks impressive but asks very little of you on a busy evening.
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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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