Fábrica da Nata comes in at a solid third on our list. The egg tart was really good. Delicious in fact. In all honesty, things started getting a bit blurry but taking all factors into consideration, the tart wasn't as perfect as Manteigaria, and the pastry wasn’t as buttery as Belém. The ambiance is nice but more like a big cafe. Lots of seating and a great terrace for that perfect egg tart experience. You can also order a special that includes a croquette, coffee, and a glass of port!
PS. This location is also right off of Avenue de Liberdade which is worth a stroll while in Lisbon!