01 - Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or lightly grease it.
02 - Place the salmon fillets on the prepared baking sheet. Drizzle with olive oil, then generously sprinkle with sea salt, black pepper, and paprika (if using). Arrange the lemon slices on top of each fillet.
03 - Bake the salmon for 12–15 minutes, or until the fish is opaque throughout and flakes easily with a fork.
04 - While the salmon bakes, prepare the salsa: In a medium bowl, combine the diced tomatoes, finely chopped red onion, optional jalapeño, chopped cilantro or parsley, lime juice, olive oil, salt, and black pepper. Toss gently to ensure all ingredients are well mixed.
05 - Carefully remove the baked salmon from the oven. Transfer the cooked fillets to individual serving plates. Spoon a generous amount of the fresh salsa over each salmon fillet.
06 - Serve the baked salmon immediately, accompanied by fresh lemon wedges if desired.