Mix the olive oil, lemon juice, garlic, oregano, chili flakes, salt and pepper.
Add the feta cheese, stir, cover and then put in the fridge for two hours to rest.
Slice the lemon and onion into thin slices, spread them on the bottom of the bakeware.
Place the salmon fillets on top, add salt and pepper to taste and bake at 180°C for 20 minutes.
In a medium sized bowl put the cherry tomatoes, cucumber, olives, onion and add the dill.
Add salt and pepper to taste and mix.
Add the feta with its brine to the vegetables and stir.
Serve the salmon with the vegetable and feta mix as a side dish.
