Peel and chop the onions. Clean, wash and slice the tomatoes. Drain apricots and cut into slices. Caramelise 200 g sugar in a pot. Remove the pot from the stove.
Stir in onions. Add vinegar, pepper and mustard seeds and simmer for about 5 minutes. Add tomatoes and apricots and let it boil down at low heat for about 30 minutes until thick. Season to taste with salt and possibly sugar. Fill the chutney into clean glasses and close them immediately