Hidden away uphill at the Rupa Wasi hotel, most tourists don't even realize that this place exists. Among foodies in the know, though, this is one of the top restaurants in Aguas Calientes. It is. In a town dominated by hotel restaurants and identical-menu mediocre backpacker fare, the Tree House makes pastas by hand and incorporates local ingredients into the dishes, like glazing pork ribs in an elderberry and tamarind sauce, or serving alpaca anticuchos (skewers) with ají amarillo (yellow chile pepper) fettuccine. The atmosphere here is pleasantly rustic. The interior is almost entirely made of wood, aside from a stone fireplace and a few blackboards that list the daily specials. Cooking lessons ($95) are offered daily from 10am to 2pm and include a market tour and full lunch.