article_snippet.sent: Half fill a deep-fryer or large saucepan with oil and heat to 190°C (the oil is hot enough when a cube of bread dropped in the oil turns golden in 30 seconds).
article_snippet.sent: Meanwhile, heat the pasta sauce in a small saucepan over low heat until hot.
article_snippet.sent: Cook penne in a large saucepan of boiling well-salted water until just tender; drain, cover to keep warm.
article_snippet.sent: Heat oil in the same saucepan over medium heat.
article_snippet.sent: Return the hot pasta to the saucepan with the butter and fetta.