Peel and chop the mangoes into rough cubes.
Heat a large saucepan over medium heat and add the mango, salt, and vinegar.
Add the ginger to the pan and stir to combine.
Add the sugar, whole grain mustard, and sultanas. Stir to combine.
Add the chopped red chili pepper and stir to combine.
Reduce the heat and simmer for 50-60 minutes or until the chutney is thick and sticky. Then remove it from the heat.
Allow the chutney to cool for 10 minutes and place it in a sterile jar.
Enjoy the chutney immediately or store in the refrigerator for up to 6 months unopened.