Matthew Ryle on Instagram: "AD The No.1 Croque madame There’s only one No.1 @waitrose Ingredients: Mornay (4 portions) 40g Butter 35g Flour (plain) 300g Milk (from above) Salt + pepper 100g No.1 Smoked silver fox cheddar (grated) 30g Dijon mustard - Bring the milk to the boil and remove from the heat, infuse. - Melt your butter fully and add your flour. Cook the roux for around 3 minutes, over a medium heat before adding any milk. - Slowly add your infused milk one ladle at a time, mix until ful