Pour in the wine and bring to a simmer until it has reduced by half. Drain the tin of lentils then empty them into the sauce along with the tin of tomatoes, the olives and the stock. Season generously then bring to the boil. Reduce the heat and simmer uncovered for 45 minutes to an hour until the liquid has evaporated, the lentils are soft and the sauce is thick. Taste and season with salt and black pepper if necessary.
Ten minutes before serving bring a pan of salted water to the boil and add your dried pasta. Cook according to packet instructions until al dente. Drain and toss through the ragu.