Preheat and prep: Heat the oven to 400°F (200°C). Line a sheet pan with parchment for easy cleanup.
Season the salmon: In a small bowl, mix 1 tablespoon olive oil, lemon zest, half the lemon juice, garlic, oregano, thyme (or dill), smoked paprika, 1 teaspoon salt, and 1/2 teaspoon pepper.
Brush or rub over the salmon.
Roast the salmon: Place salmon on the pan and roast 10–12 minutes, depending on thickness. It should flake easily and still look a little glossy in the center. Rest 5 minutes.
Cook the grain (if not done): While salmon roasts, cook your chosen grain according to package directions.
Fluff and let it steam off to reduce moisture before packing.
Mix the salad: In a large bowl, combine tomatoes, cucumber, red onion, olives, and herbs. Whisk dressing ingredients in a cup, then toss with the salad. Add feta if using.
Taste and adjust salt, acid, and pepper.
Assemble the base: Divide grains among four containers. Drizzle with 1 tablespoon olive oil total and the remaining lemon juice to keep them lively.
Add the salad: Spoon the Mediterranean salad into one side of each container. Keep it separate from the grains if you like more texture contrast.
Portion the salmon: Place one fillet in each container.
If you prefer bite-size pieces, flake the salmon into big chunks. Avoid overmixing so it stays tender.
Finish and cool: Add lemon wedges and extra herbs on top. Let containers cool with lids ajar 15–20 minutes before sealing and refrigerating.
Store: Refrigerate up to 4 days.
For best texture, enjoy cold or gently reheat the salmon and grains, keeping the salad cool.