In a pot, brown the onion in the oil for 3-5 minutes until it is translucent.
Chop the potatoes into big chunks and add them to the pot. Cover the potatoes with the liquid you choose, season, and leave over medium-high heat fully cooked. Season, add the cilantro, and blend until creamy.
Check the seasoning and adjust with salt and pepper if necessary.
Finish with roasted peanuts, chopped almonds, and one or two fresh cilantro leaves.
Notes
What is the best way to blend a soup? It is better to start the blender at a slow speed and then increase it little by little. This way, the consistency of this soup or any other soup gets creamier, but be careful not to over-blend because the potato tends to become gooey.