Meanwhile, melt 1 cup butter in a large saucepan
, keep the heat on low and whisk in the flour -- keep stirring for 3 minutes or so, and keep it on low-medium heat so it bubbles just a little but don't let it burn. S-L-O-W-L-Y add in the liquid about 1/4 - 1/2 cup at a time and keep whisking. If you add too much at once it won't end up thick and creamy and will still taste good but it'll be more thin. Add in seasonings as you keep whisking and taste to see what it needs more of.