1.Combine vegetables in a large bowl. Sprinkle with salt. Stand, covered, overnight. Rinse vegetables to remove excess salt. Drain.
2.Place mustard, turmeric, ginger and flour in a medium saucepan. Gradually add vinegar, stirring until a smooth paste forms. Stir in celery seeds and sugar. Bring to the boil over moderately high heat. Reduce heat; boil, uncovered, for 10 minutes or until slightly thickened (you need about 2 cups liquid). Remove from heat. Cool sauce slightly.
3.Pack vegetables into hot sterilised jars. Pour hot sauce over vegies, shaking jars to remove air bubbles. Seal. Cool.