Technically once you smoke a corned beef it will become pastrami, one of my favorite leftover favorites is pastrami hash.
I had one posted on here but it wasn't a very good thread, mostly because I had to use frozen seasoned fries instead of potatoes because I was all out.
Basically just cube some potatoes and boil for 20-30 minutes until soft, almost fork tender but you want a little more firmness than that.
Mince as much onion as you like, heat a skillet (cast iron works best) and add the potatoes and onion with oil-olive oil is my preference but regular vegetable oil has a much higher smoking temp, when in the pan cook for about 10 minutes and add your pastrami, stir and place a weight or another skillet on top to keep all ingredients pressed down even, when browned on the bottom flip and either add the weight back on top till cooked to your liking or what I like to do is form a couple of wells in the mixture and crack an egg in each one but you could alwayd just cook your eggs separately and add to the top once done.
*Oh, and add salt and pepper during the cooking process, some also like to add minced garlic but with my hash I don't.