A great way to heat up pastrami lunch meat without robbing it of it's juiciness is to boil it. The boiling liquid heats up the pastrami, while also offering extra flavor if the correct technique is used. By using a liquid other than water to boil the pastrami, you can create lunch meat that has the signature bite of pastrami with additional flavors such as beer and mustard. The technique is easy and only takes a few minutes to execute.
Combine 3 ounces of beer, 1 ounce of water, and 2 tbsp. of whole grain mustard in a medium saucepan. Place the pan on the stove and bring to a boil.
Submerge the pastrami slices in the boiling liquid and reduce to a simmer. Allow the liquid to heat the meat for 3 minutes.
Remove the meat from the saucepan with a pair of tongs. Gently shake the meat to remove excess liquid and serve immediately.