Steps
1. Heat a small saucepan over medium heat and dry roast mustard seeds until they start to pop.
2. Add the finely chopped shallot, garlic, and grated ginger to the pan and sauté for 2 minutes until soft.
3. Add chopped green plums, brown sugar, apple cider vinegar, ground cumin, salt, and chili flakes.
4. Stir well and add water to prevent sticking.
5. Bring the mixture to a boil, then reduce heat and simmer for 15-20 minutes, stirring occasionally, until the plums break down and the chutney thickens.
6. Remove from heat and let it cool to room temperature.
7. Transfer to a small jar or bowl and refrigerate before serving. Enjoy chilled or at room temperature.