This is a simple, slow-cooker version of picadillo, a beloved comfort food popular across the Caribbean and Latin America (“Picadillo” roughly translates as “mince,” referring to the use of ground meat.) Its deep flavor comes from sautéed aromatics and tomatoes, simmered gently with ground beef and spices Raisins and green olives give this Cuban-inspired version its distinctive sweet-salty-tangy pop, and here, they are added toward the end of the long cooking time so they retain their intensity