Lemon and white chocolate blondie with toasted Italian meringue

Lemon Meringue Blondie:  White Chocolate 22% (Sugar, Cocoa Butter, Dried Whole Milk, Emulsifier (Sunflower Soya Lecithins), Flavouring), Lemon Curd 20% (Sugar, Water, Glucose Syrup, Concentrated Lemon Juice, Margarine (Fat Blend [Palm, Palm Stearine, Coconut Oil, Rapeseed oil], Water, Lemon Juice), Egg powder, Wheat Starch, Modified Wheat Starch, Gelling Agent: Pectin, Sicilian Lemon Oil, Acidity Regulators: Citric Acid, Trisodium Citrate, Colours: Lutein, Curcumin), Sugar, Vegetable Fat Spread [Vegetable Oils (Rapeseed, Palm, Sunflower), Water, Salt, Buttermilk, Preservative (Potassium Sorbate), Emulsifier (Mono and Diglycerides of Fatty Acids), Acid (Citric Acid), Flavourings, Vitamin A and D, Colour (Carotene)], Eggs, Wheat Flour (Wheat Flour, Calcium Carbonate, Iron, Niacin, Thiamin), Lemon flavouring, Cream of Tartar