Wash and cut onion, broccoli, zucchini, and spinach into bite-sized pieces.
Heat olive oil in a pot and sauté minced garlic.
Add the onion and cook until it becomes translucent.
Add the remaining vegetables and sauté for about 3 more minutes.
Pour in 400ml of water and simmer on medium heat for 10 minutes.
Season with salt and pepper.