In a pressure cooker pan, heat olive oil on medium heat.
Add the chopped garlic and leak. Saute till the leek shrinks.
Add the chopped broccoli and potato. Mix well.
Add water. Mix well. Close the pressure cooker lid with the ring. Put the whistle and cook for 4 whistles on high heat and 2 small whistles on low heat.
Let the pressure cooker cool by itself. After the pressure cooker cools, remove whistle and open the lid.
With the help of stick blender, blend the cooked ingredients till smooth. (If you want to blend the ingredients in the mixture jar, let it cool down completely and then blend).
Put the blended mixture in the pot. Season with salt and pepper.
Mix well and let it boil for 10 minutes.
Serve hot soup in a bowl. Sprinkle some black pepper powder and serve.