Vegan stall in the "Galería Canalejas" food hall (entrance on Alcalá Street) next to Canalejas Square.
They have salads, bowls, smoothies, gluten-free toast, soups.
We ordered a salad and it was very fresh, made to order (they gave us a warning and it took them about 10 minutes to make it) and very tasty and healthy. As they say, they incorporate super foods, the price I think I remember was about €14. It was quite filling, I liked it!