Preheat oven to 200 C (400 F). Wash the fillets and rinse them. Put the fillets on to the baking paper and start to season them with freshly ground black pepper and salt.
Put the whole shallots, sliced garlic cloves, thyme leaves, cherry tomatoes and green olives on top of the fillets. Pour the olive oil to the fillets and to the ingredients evenly and cook 45 minutes.
Tip: Garnish it with dill.