Chargrilled Chicken Burger

SOURDOUGH BURGER BUN (White Flour (WHEAT Flour, Calcium Carbonate, Iron, Niacin, Thiamin), Water, Shortening (Emulsifier: E471; Rapeseed Oil), Sugar, White Starter (WHEAT Flour, Water), Dried WHEAT Sourdough (WHEAT Flour, Starter Culture, Flour Treatment Agent: Ascorbic Acid; WHEAT Gluten), Yeast, Salt, Enzymes, Flour Treatment Agent: Ascorbic Acid; Glaze (Pea Protein, Dextrose)), CHARGRILLED CHICKEN (Chicken Thigh, Water, Salt, Dextrose), TOMATO RELISH (Tomatoes, White Onion, Cornflour, Brown Sugar, Rapeseed Oil, Cider Vinegar, Salt, Smoked Paprika, Lemon Juice Concentrate), TARRAGON MAYONNAISE (Rapeseed Oil, Water, Spirit Vinegar, Salted Free Range EGG Yolk (Free Range EGG Yolk, Salt), Horseradish, Cornflour, Free Range EGG, Tarragon, Salt, Dijon MUSTARD (Water, MUSTARD Seed, Spirit Vinegar, Salt), Lemon Juice, MUSTARD Extract), GHERKINS (Gherkins, Water, Spirit Vinegar, Salt), SALAD LEAF. ​