Wet the outside of the rye bread and bake for 10 minutes at 350°F to make it crispy on the outside and fluffy on the inside.
Steam the hot pastrami in a low oven at 200°F to warm it through without drying it out.
Make the coleslaw by grating cabbage and carrots, adding mayonnaise, sour cream, distilled white vinegar, sugar, and letting it sit to become saucy.
Make the Russian dressing by mixing mayonnaise, pickle relish, ketchup, and buttermilk.
Assemble the sandwich by spreading Russian dressing on both sides of the bread, adding hot pastrami, Swiss cheese, and coleslaw.
Slice and serve immediately.
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