Caramelised Onion Tart with Rocket Salad & Toasted Walnut

Onions : Red (Red Onion.), Jus-Rol Puff Pastry : Sheet (**Wheat** flour, water, vegetable oils and fats (palm, rape), salt, emulsifier (mono- and diglycerides of fatty acids), flour treatment agents (ascorbic acid, L-cysteine).), Tomatoes : Cherry Red Vine (Cherry Tomatoes on the Vine), Butter : Unsalted (Butter (**Milk**) (**Milk**)(Minimum Fat Content 82%)), Mikado : Balsamic Vinegar (Red Wine Vinegar, Grape Must, Colour: Caramel, Preservative: Potassium metabisulphite), Walnuts : Halves (**Walnuts**), Beechwood Eggs : Free Range : Medium, Brakes Rapeseed Oil : Extend Life (Rapeseed Oil, Anti-foaming Agent(Dimethylpolysiloxane).), Thyme (Thyme), Sage (Sage), Maldon Sea Salt (SEA SALT), Lettuce : Rocket / Roquette Arugula