01 - Set oven to 425°F (218°C) and allow it to fully preheat.
02 - Toss halved radishes with 1 tablespoon olive oil, 1/2 teaspoon kosher salt, and 1/4 teaspoon black pepper on a baking sheet. Spread evenly in a single layer.
03 - Roast radishes for 10 minutes to begin softening.
04 - Cut four pieces of parchment paper large enough to fold over each salmon fillet. Lay a fillet in the center of each paper, season with 1/4 teaspoon salt and 1/8 teaspoon black pepper per fillet, top with minced garlic and sliced lemons, drizzle with olive oil, and sprinkle chopped dill.
05 - Fold parchment over salmon and crimp edges to seal tightly, forming a pocket to trap steam.
06 - Remove radishes from oven, push to one side of baking sheet, and place sealed salmon packets alongside. Return to oven and bake for 14 minutes.
07 - Open each parchment packet carefully, allowing steam to escape. Plate the salmon with roasted radishes and serve immediately.