before that I've watched plenty of tutorials on youtube. Many of them have similar routine, only the amount varies. OK then, let me tell you my way to make it. My way was First putting 25g of butter and heat it gently until it melt. Then I add approximately 25g (maybe 40g I believe) of all-purpose flour to the butter and mix them quickly. Then I add some cold milk, mix it, until it burns to creamy state, I add further milk, untreated pepper, table salt to it and mix them again. Finally, I add my grated cheddar cheese (approx. 80g, one-third of a 250g processed cheddar cheese) and mix them again for some time. The result was - The sauce was unsatisfactory. I can't say that it's terrible but it is undoubtedly not tasty. It feels so heavy and I felt so full after that. I can't smell the taste of the cheddar. I believe I've added more than 500ml of cold milk but the sauce was not creamy but a lttile bit like paste.