Add the olive oil and chopped onions to the cooking pot; add a pinch of salt, the sugar, and bicarbonate. Let it cook for around 10 minutes, mixing it sometimes until you get the caramelized onions. Then add 1L water, the carrots broccoli stems, laurel leaves and all the powders; let it boil. After like 5 minutes add the rest of ingredients, taste salt and slow cook 10 more minutes. Serve with some cheese on it.