Start by collecting the necessary ingredients.
You will need ripe mangoes, mustard seeds, fenugreek seeds, red chili powder, turmeric powder, salt, and mustard oil.
Wash the mangoes thoroughly and pat them dry.
Cut into bite-sized pieces, remove the pits, and arrange in a dry bowl.
In a separate bowl, mix all the spices as per your taste preferences.
Crush the mustard and fenugreek seeds coarsely to release their flavours.
Combine spice mix with diced mangoes, ensuring an even coating.
Allow the mixture to marinate for hours or overnight for enhanced flavours.
Heat mustard oil until smoking and then pour the cooled oil over mango-spice mix.
Transfer the pickle to a clean, airtight glass jar, and enjoy a spicy homemade mango pickle.