Dried ají mirasol comes in two options of presentations: whole or clean. If it's whole, you want to chop off the tips, open it in half and use a spoon to scrape out the seeds and veins.
Place the chilli in a pot and cover it with water at room temperature.
Place the pot over medium-high heat and let it boil for 10-15min for the chillis to soften.
Drain the water and place the chillis in a blender or food processor along with 50ml (about 5 tbsp) of vegetable oil.
Turn on the blender or food processor and add more oil a little at a time, just enough for the blender or processor to turn the chillis into a paste.
Remove from the blender or food processor and freeze in ice cube trays, containers or reusable bags. You can freeze it for up to a year.