transfer immediately to large bowl of cold water to chill. Blanch peppers and onions in similar way, boiling peppers for 1 minute and onions for 2 minutes. Drain thoroughly. In a medium bowl, blend tumeric, mustard, flour and salt into sugar. Stir in cold water to make a smooth paste. In a large heavy preserving kettle, combine vinegar and celery and mustard seeds; bring to boil. Stir in about 1 cup of spiced vinegar into mustard paste, then whisk mustard past into spiced vinegar in saucepan. Cook over medium heat, whisking constantly until sauce is smooth. Reduce heat and simmer uncovered, for 5 minutes. Pour drained vegetables into sauce; mix well and return to a boil. Reduce heat and simmer 4 5 minutes or until vegetables are tender. Ladle into hot sterilized jars leaving 1/8 inch head space. Seal. I prefer to process these in a boiling water bath for 10 minutes for 1/2 pint jars and 15 minutes for pint jars. Makes about 9 cups.