I hate to disagree with my esteemed fellow LTHers in this thread, but I gave up DeLuca's many years ago for its lesser known and generally less packed neighbor JoJo's. Nevertheless, DeLuca's has received a good bit of love from the foodie media, so during my recent visit to the 'Burgh, I decided to give the place another shot. Boy do I regret it.
Our server (as well as the Man vs. Food guy) recommended DeLuca's specialty: The Mixed Grill. I went with hot Italian sausage for my choice of meat.

The sausage was quite good, but the rest of the plate was very poorly executed. Eggs not over-easy, but overcooked, with only barely runny yolks. Where the dish
really failed was when I found that the eggs and sausage were being used to hide a pile of the most insipid vegetables and potatoes that I've ever tasted. It is really hard to imagine that anyone could eat this clump of steamed, limp, completely unseasoned garbage and like it.

A few bites in, I actually tried to convince REB that we should just pay for our food and go elsewhere for breakfast. She declined, and my guess is that she came to regret that decision. Here's why:

She ordered the Santa Fe Burrito. Now I know what you're thinking -- Pittsburgh is no place to order a burrito at a diner. But it was a breakfast burrito, and the server said it was their second most popular dish, and it was a breakfast burrito, and... Wrong.
The flour tortilla was crunchy, and not in a crisped-under-the-broiler kinda good way, but more in a week-and-a-half-old-should-we-still-be-serving-this kinda bad way. REB declared that the chorizo tasted more like sloppy joe. I don't even want to talk about the mealy tomato slices, or the brown cubes of avocado, or the sickly sweet sauce.
DeLuca's, we're done. Forever. Now, on to the good stuff...
Dear LTH community: If you find yourself in Pittsburgh, in the Strip District, for breakfast, please give JoJo's a try. It's two and a half blocks and a whole world away from DeLuca's.
Don't go looking for pleasant service or (any) decor though. JoJo's has the same brusque, old school diner approach to service, but man do they know how to cook breakfast.
Behold, the JoJo's Omelet:

This magnificent thing is a three-egg omelet filled with mushrooms, peppers, and caramelized onions, your choice of meat (hot or sweet sausage, or ham), cheddar cheese, and hash browns. Then they drop the sucker on top of a base of their crispy, delicious hash browns. It really isn't meant to be eaten by one person in one sitting. Share one with someone you love.
I guess that's my only problem with JoJo's - they don't know how to put out a plate with a reasonable quantity of food on it. Here's their standard, no frills, egg breakfast:

That's three perfectly cooked, over-easy eggs, a frisbee-like slab of juicy hot sausage, and fantastic, extra-crispy hash browns.
Go hungry. Very hungry,
--Rich
Jo Jo's Restaurant
110 24th St.
Pittsburgh, PA 15222
412-261-0280
I don't know what you think about dinner, but there must be a relation between the breakfast and the happiness. --Cemal Süreyya