Everyone loves a good hearty stew in winter to curl up to whilst watching telly. This is by far one of the cheapest and easiest to make.
A roux is a mixture of equal butter and plain flour that is mixed together to thicken a dish. I made mine ridiculously simple by melting a tablespoon of butter in the microwave and adding a tablespoon of plain flour and then mixing with a fork. When it's combined, add it a bit at a time to make sure it dissolves into the stew instead of sitting lumpy on top.