Drop vegetables in hot boiling salted water and blanch until slightly cooked but still crisp.
Remove from water, drain and allow to dry out.
Blend mustard seeds, turmeric powder with garlic and a little water.
Heat oil, fry onion until transparent. Add the mustard/garlic/turmeric paste and some salt. Stir fry for one minute until cooked.
Add vegetables and green chillies, mix well until well coated. Remove from heat.
Allow to cool and stir in the vinegar.
Place in dry jars and store in refrigerator.
Enjoy as an appetiser or in white bread rolls.