Cut green tomatoes, onions and apples into dice of roughly the same size so they cook evenly.
Add onion, green tomato, apples and sultanas, along with chilli flakes, sea salt, grated ginger and cider vinegar, to a large preserving pan.
Give the ingredients a good stir before stirring in the sugar.
Make up your spice bag by tying the spices in a large muslin square or use a ready made spice bag.
Add spice bag to the pan and slowly bring ingredients to the boil.
Turn the heat down to low and let the chutney mixture simmer for at least 1½ to 2 hours.
Stir every now and then to prevent chutney sticking to the bottom of the pan.
Check for thickness by drawing a silicone spatula or wooden spoon through the chutney mixture. Your chutney is ready when it parts to reveal the pan base and this remains visible for a few seconds.
Remove spice bag and discard.
Whilst chutney is still hot, ladle into sterilised jars and fill to within 6mm (1/4″” inch) of the top. Use the back of a spoon to pack down your chutney and remove any air pockets.
Seal tightly with a lid.