Rinse sardines under cold, running water; clean and remove any scale from sardines. Cut-off sardine heads.
Press juice of 1/2 a lemon; thinly slice all remaining lemons. Sprinkle sardines with lemon juice.
Preheat oven to 350°F (180°C).
Brush an oven-safe dish with a little olive oil.
Rinse and wipe dry thyme sprig. Arrange thyme sprig and lemon slices over the bottom of prepared dish.
Arrange sardines, side-by-side on top of lemon slices. Generously salt and pepper. Pour in dry white wine and remaining olive oil.
Rinse and chop parsley sprig. Mix together chopped parsley and breadcrumbs; sprinkle mixture all over sardines.
Bake into preheated oven for 10 minutes, sprinkling mixture once or twice with cooking liquids.
Sprinkle mixture once or twice with cooking liquids.
Serve, really hot.
