For the zucchini chutney, wash and dice the zucchini and let it sit overnight with salt. Mix vinegar, granulated sugar, mustard flour, paprika powder, curry, bell pepper and bring to a boil.
Strain the zucchini, chop the onion and green bell pepper. Add everything to the vinegar broth and cook for about 15 to 20 minutes.
Stir 3-4 tablespoons of flour with water and add to the broth, boil again. Pour hot into jars and seal well.