Cathedral City Cheese and Onion Toastie

Ingredients White Bread (Wheat Flour (Wheat Flour, Calcium Carbonate, Iron, Niacin, Thiamin), Water, Yeast, Salt, Rapeseed Oil, Soya Flour, Preservative: Calcium Propionate; Emulsifier: Mono- and Diacetyl Tartaric Acid Esters of Mono- and Diglycerides of Fatty Acids; Flour Treatment Agent: Ascorbic Acid), Cathedral City Extra Mature Cheddar Cheese (31%) (Cheddar Cheese (Milk), Potato Starch), White Sauce (Partially Reconstituted Skimmed Milk, Water, Double Cream (Milk), Coconut Oil, Modified Maize Starch, Flavouring, Soya Flour, Salt, Emulsifier: Sunflower Lecithins), Roasted Red Onion (10%) (Red Onion, Sunflower Oil), Dijon Mustard (Water, Mustard Seed, Spirit Vinegar, Salt). ALLERGY ADVICE: FOR ALLERGENS, SEE UNDERLINED INGREDIENTS IN BOLD. ALSO, MAY CONTAIN EGG AND FISH.