Vegetables of all kinds should be thoroughly picked over and well washed, and it is good sometimes to lay them into cold water a short time before cooking. Salt should not be added until partly cooked, as it has a tendency to harden them; they should cook steadily, do not allow them to stop boiling or simmering until they are thoroughly done. Drain, take some butter, heat it, add a little flour, mix smooth in the butter, add milk enough to make a smooth gravy, turn over vegetables, and let it heat through, then serve. This sauce is nice for many kinds. For asparagus, carrots, peas and a few others I keep some of the liquid they were boiled in, as it gives them a better flavor than milk alone.