Place the chopped vegetables, apple and chilli in a large pan and stir in the sugar, vinegar, seeds, paprika and salt.
Cook gently, stirring until the sugar dissolves. Bring to the boil and simmer gently for 20 minutes until thickened.
Cool slightly before spooning into sterilised jars, top with a waxed disc and sealed with a lid.
Cook’s tip: to sterilise the jars, wash in warm soapy water and rinse well. Place the jars and lids in a preheated 150ºC/Fan 130°C/Gas 2 oven for 10 minutes until completely dry. If using kilner jars with rubber seals, boil them in a large pan of water instead as the dry heat of the oven will damage them.