Buenos Aires , of course , is beef-crazed , and Cabana Las Lilas -LRB- Avenida Alicia Moreau de Justo 516 ; 4313-1336 ; www.laslilas.com -RRB- , based in the tourist-packed Puerto Madero port , is arguably its most famous , and expensive , purveyor , where a T-bone steak costs 49 pesos .