UK Brown & Polson Cornflour 500g. UK Brown & Polson cornflour — not a US cornstarch box. $16.99 — add $82.01 for free shipping over $99. First order: use NEW10 for 10% off at checkout. Highlights Perfect for thickening sweet or savoury sauces, crispy coatings and baking Cooking with Brown & Polson cornflour since 1840 Gluten free Suitable for coeliacs Suitable for vegetarians Ingredients Cornflour Allergens Cereals Containing Gluten Directions for use For gravy: blend 2 tbsp cornflour with 2 tbsp cold water. Stir into 500ml of hot stock made with the juices from the roasting tin. Bring to the boil then simmer for 1 minute, season to taste. Add 1/2 tsp of cornflour to each egg white when making meringues to give a marshmallow centre. When grilling or frying meat and fish first coat with cornflour to seal in the flavour. For lighter cakes and puddings use 4 parts plain flour to 1 part cornflour.