Coarsely grind the onions and peppers. Stir in zucchini and salt. Cover and allow to sit for 3 hours. Drain and rinse well.
Combine the remaining ingredients to make a syrup, boiling until sugar dissolves and mixture has thickened. Add to vegetables and cook for 20 minutes.
Ladle into hot canning jars, adjust seals. Process in a boiling water bath for 10 minutes.
Submitted by: CM