Psari Plaki

"Plaki" denotes the method, not a fish: the word derives from the ancient Greek plax / plakion, a flat stone or marble slab used for baking, and in the kitchen it came to mean food baked flat in a dish over a bed of sauce. The technique is old and pan-Mediterranean — baking fish over oil, onion, and herbs is documented from the Byzantine era onward — and it became the default way to cook a whole fish across the Greek coast and islands precisely because it is forgiving and showcases the catch rather than masking it. Tomato is a relatively late addition, entering Greek cooking only after the fruit spread through the country in the 19th century; older plaki relied on onion, oil, lemon, and herbs.

Moist flakes of white fish lifting cleanly off the bone, having absorbed the sweetness of the onions and the acidity of the tomato beneath. The vegetable bed cooks down to a soft, oily, jammy sauce you spoon over the top. Bright lemon, grassy olive oil, the perfume of parsley and a little oregano. Many Greeks prefer it lukewarm or cold, when the oil has set and the flavours have married.

Fish is delicate protein with little connective tissue, so the danger is overcooking, not toughness — the vegetable bed is the insurance policy. Slicing the onion and tomato thin and starting them in the oven first softens them and turns them into a moist cushion, so the fish poaches gently in the oil-and-vegetable juices rather than drying in direct heat. A whole fish is more forgiving than fillets because the bones and skin slow heat transfer and keep the flesh succulent; doneness is reached the moment the flesh turns opaque and pulls from the bone (roughly 55°C internal). Olive oil is used in volume here not as a garnish but as the cooking medium: it carries the aromatics and bastes the fish from below.