How do you thicken Tuna Mornay?
How do you thicken Tuna Mornay? Make a cornstarch slurry for a fast and easy thickener. Use one tablespoon of cornstarch per cup of liquid you would like to thicken. Stir out all the lumps. A few minutes before your casserole is done, add it a little at a time until you are happy with the thickness. Then, let the casserole finish baking. How long does tuna mornay last in the fridge? Leftovers - Store in the fridge for up to 4 days, reheat in microwave. Where does Tuna Mornay come from? Also common in most parts of Australia this...