Since 1837, this patisserie has been transporting locals to sugar-coated nirvana with heavenly pastéis de belém: crisp pastry nests filled with custard cream, baked at 400 degrees for that perfect golden crust, then lightly dusted with cinnamon. Admire azulejos in the vaulted rooms or devour a still-warm tart at the counter to try to guess the secret ingredient.