Sauteing vegetables: Heat the oil in a pan over medium-low heat. Add the chopped onion. Cook and stir until it turns translucent. Add cumin powder, bay leaf, celery. Cook and stir for a minute.
Cooking roots: Add carrots, celeriac, and potatoes, lower heat to a minimum, and add two tablespoons of broth.Cover and simmer for 5 minutes, stirring occasionally to prevent sticking or burning.
Boiling: Add the remaining vegetable stock, cover, and simmer until the vegetables are cooked through.Remove from the heat and cool to room temperature.
Blending: Once cool, blend the soup, season with salt and pepper to taste.
Reheating: Return to the pot and reheat.
Serving: Serve and garnish with the garnish combination of your preference.
Notes
If you can't find cepa de apio, celeriac will work too.If you want to make the soup a bit more creamy and thick, just let more liquid evaporate.Nutritional information was calculated using celeriac, as cepa de apio is not included in the food database used to calculate it.For a vegan version, just do not use sour cream for garnishing, all the other ingredients are vegan-friendly.