Skinless and Boneless Portuguese Sardines in Pure Olive Oil harvested off the coast of Portugal, are said to be the sweetest and most succulent in the world. They are caught in seines (fishing nets) and once harvested, are in the can within hours. How can this happen? Manual cleaning, careful handling and then traditional cooking in a grill oven with extra virgin olive oil. Yes, Portuguese sardines ... no wonder they've always been famous.