Mustard Free Pesto-Walnut Trout with Green Beans & Fingerling Potatoes Sheet Pan Dinner
This sheet pan dinner is the kind of weeknight meal that looks like you spent way more effort than you actually did — golden fingerling potatoes, crisp-tender green beans, and silky trout fillets all coming together on a single pan. The real star is the homemade walnut pesto, blitzed together from fresh basil, raw walnuts, garlic, and lemon juice, then spooned generously over each fillet before it goes back into a hot oven. It clings to the fish as it roasts, creating a fragrant, nutty crust that keeps the trout moist and packed with flavor. For anyone navigating a mustard sensitivity, this recipe is a natural fit — every component is straightforward and clean, with no condiments or sauces that typically sneak in that ingredient. Store-bought pestos and marinades are common culprits for hidden mustard or mustard flour, so making the pesto from scratch here puts you fully in control. The whole thing comes together on one pan with a logical stagger — potatoes go in first, then beans, then fish — so nothing is over- or undercooked by the time it hits the table. Finish with a squeeze of lemon and dinner is done.
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Learn more →Ingredients
4 servings
For the sheet pan
- 1 ½ lb fingerling potatoes, halved lengthwise
- 3 tbsp extra-virgin olive oil, divided
- ¾ tsp kosher salt, divided
- ½ tsp black pepper, divided
- 12 oz green beans, trimmed
- 4 trout fillets (about 6 oz each), skin-on
For the pesto
- 1 cup fresh basil leaves, packed
- ½ cup raw walnuts
- 2 cloves garlic
- ¼ cup extra-virgin olive oil
- 2 tbsp fresh lemon juice
- ¼ tsp kosher salt
For serving
- lemon wedges, 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 fingerling potatoes with 2 tablespoons of the olive oil, 1/2 teaspoon of the salt, and 1/4 teaspoon of the pepper directly on the prepared sheet pan. Arrange cut-side down in a single layer. Roast for 15 minutes, until the cut sides begin to turn golden.
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