African immigrants were assimilated, but their contributions live on. Tango was midwifed by africans- "Milonga", for example, is an west african loanword, as is "quilomobo", "mucama", and "mondongo". The word Tango itself is generally considered to be Niger-Congo in origin.
Oscar Aleman was afro-brazilian-gurani, and his music is an essential building block.
And Asado, as we know it, was invented by Antonio Gonzaga, another african-argentine.
Certainly gauchos cooked meat over wood, but the way a parilla is used, the mix of meats, and the urbanization of asado is all Gonzaga.
Argentines often conveniently forget the contributions of Africa in current argentine culture and lifestyle, but, as in all of the americas, its there if you look.
https://www.nytimes.com/2014/09/14/travel/argentina-rediscovers-its-african-roots.html