No matter how much whisking I did, I have never made lump free gravy- I have had to pass it through a fine mesh strainer to get rid of the lumps. Today we cooked a chicken. I got a sealable container, and added water and flour to it. Then, I put the lid on and shook it like crazy. Ckicken drippings and juice in the pan, then whisked in the flour and water mixture. It resulted in no lumps. Even the wife said I did well.