Cut the onion, broccoli, and spinach into bite-sized pieces.
Heat a little olive oil in a pot and sauté the onion.
Add broccoli and spinach and stir-fry.
Pour in water and soy milk and bring to a boil.
Season with salt and pepper.
Blend all ingredients until smooth in a blender.
Pour back into the pot and bring to a boil once more.