To make vindaloo goan style hot and sour pork rice, first you will need to cook the pork in a pan on medium heat until it is browned on all sides. Then, add the chopped onions and garlic and cook until the onions are translucent and the garlic is fragrant, about 5 minutes. Add the tomatoes, tomato paste, salt and pepper to taste. Bring the mixture to boil, then reduce the heat to medium low and simmer for 20 minutes, stirring occasionally. Remove the pan from heat and let it cool to room temperature. Once cool, you can store the leftovers in an airtight container in the refrigerator for up to 3 days.