This makes a hearty breakfast or dinner, and is especially lovely with some fresh-baked crusty bread.
Simply dump some tomato sauce into a skillet, enough to come about an inch up the sides, and get it simmering over medium heat. Make four wells in it, and crack four eggs in. Cook gently until the whites are opaque and the yolks are as set as you like them. Scoop out with sauce, over bread, and crumble feta cheese on top.