Linguine with Spiced Beef and Onion Sauce and Feta

A ground-beef sauce seasoned with fragrant spices and generous amounts of onion and garlic is lightened with a good dose of mint at the end. Rather than sprinkle the feta as a garnish, we toss the just-cooked noodles with most of the cheese so that it melts and coats the strands. If you like, you could serve the sauce with warmed flatbread instead of on noodles.