Heat 2tbsp oil in a large non-stick frying pan, sprinkle the plaice skin with most of the salt and place skin side down in the pan.
Fry for 2-3 minutes, using a fish slice to press the fish flat in the pan. Once the skin is crispy, carefully turn the fish fillets, and cook flesh side down for 2 minutes until flaky.
Add the remaining 1tbsp oil, capers, lemon zest and juice, tomatoes, and olives, heat for 1 minute.
Scatter with the parsley and remaining salt, serve immediately with new potatoes and green beans