Harvest and prepare the red chilies. Wash them and remove the stalks.
In a blender, combine the red chilies, garlic and the cooking oil. Blend for a few seconds until almost smooth.
Pour the chili mixture to a heated pan and let this cook for 15 to 20 minutes using low heat. Stir occasionally to avoid burning. Season with some salt, pepper, sugar and oyster sauce. Stir until well blended.
Then, add the vinegar. Do not stir for 3 minutes. Then, stir well and cook for another 15 to 20 minutes using low heat.
Turn the heat off and let them cool first before adding them into jars.
Enjoy the chili garlic oil as a dip, or use it as a base oil for your savoury dishes. Yum!
