Roasted Salmon & Asparagus with Dill-Mustard Sauce

Preheat oven to 425 degrees F.

Combine potatoes, 1 Tbsp. oil, and 1/4 tsp. each salt and pepper in a medium bowl; stir until evenly coated. Spread on a large rimmed baking sheet. Roast for 10 minutes.

Meanwhile, toss asparagus with 1 Tbsp. oil and 1/4 tsp. salt in the medium bowl. After the potatoes have roasted for 10 minutes, remove from oven. Stir the potatoes and add the asparagus in an even layer. Nestle salmon pieces among the vegetables. Sprinkle the salmon with the remaining 1/4 tsp. salt and top with dill sprigs and lemon slices.

Continue roasting until the vegetables are tender and beginning to brown and the salmon flakes easily with a fork, about 10 minutes more.

Meanwhile, heat the remaining 2 Tbsp. oil in a small skillet over medium heat. Add shallot and cook, stirring, until just beginning to brown, about 3 minutes. Whisk in mustard, capers, lemon juice, and the remaining 1/4 tsp. pepper; heat through. Stir in chopped dill.

Discard the lemon slices and dill sprigs. Serve the salmon and vegetables with the dill sauce and garnish with additional fresh dill, if desired.