Why are the best greasy spoons always by the airport? Open 24 hours, Dot is off I-45 just down from Hobby. At times, it seems like the entire restaurant and everything in it -- including the hardworking waitstaff -- is covered in a thin layer of grease. Everything comes in hefty portions, and daily specials include fried catfish and pot roast. The marquee advertises shakes, steaks and pancakes. The Houston omelet, which is stuffed with bacon, ham and pork sausage, is delicious. And anything you order is available topped with homemade chili. If Dot were a citywide chain, we'd all need a Lipitor dealer.