Start by preparing the navel pastrami. Depending on when you need it for, you can pick which method works best for you! Place the pastrami on top of small inverted pan and fill the crock pot or pan with water until it's just touching the pastrami.
Oven: Bake at 300F in a 9x13 pan for 4 hours.
Crock pot: Cook on low for 8-10 hours.
Next, prepare the Pico de Gallo and jalapeno cream sauce. Store in the fridge until use. Just before serving, toast the tortillas over an open flame for a few seconds on each side until lightly charred.
To assemble: Shred the pastrami and place in the middle of an open taco. Top with Pico de Gallo and jalapeno sauce.