By Lefteris Papadimas and Deepa Babington ATHENS (Reuters) - Greek Finance Minister Yanis Varoufakis has raised a fresh furore by telling a newspaper that he taped a confidential meeting of euro zone finance ministers, drawing criticism that he was undermining Greece's efforts to secure aid from lenders. Since assuming his post in January, the outspoken Varoufakis has often found himself in the midst of controversy over his brash style and sharp-tongued barbs against creditors at a time when Greece needs their help to avert bankruptcy. In an interview with the New York Times magazine, Varoufakis denied his peers lashed out at him or called him names in Riga.