Cut tempeh in half lengthwise and then cut it through the middle for 4 thin slices.
Combine the ingredients for the tempeh marinade in a shallow dish. Add tempeh and marinate for at least 30 minutes.
Heat a large cast-iron skillet over medium heat with 2 tablespoons oil. Add tempeh and cook for about 5 minutes per side, until dark brown. Once both sides are browned, add reserved marinade and let it cook-off in the skillet. This allows the flavors to seep into the tempeh deeper.
Butter 4 slices of Sprouted Rye Seed Bread. Place on the skillet and cook for 3-4 minutes, until lightly brown. Flip bread. On the cooked side, add Russian dressing to all slices of bread. Divide the sauerkraut between two slices, top with 2 pieces cooked tempeh, each, and a slice of vegan swiss, if using. Add the second slice of bread and cook on each side for about 5 minutes, until bread is browned and everything is cooked all the way through.
Remove from heat and serve immediately.
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Notes
Serving and Storing - Serve immediately with Creamy Tomato Soup or a large Caesar Salad. Store leftover tempeh in an airtight container in the refrigerator for up to three days. Leftover Russian Dressing can be stored in the refrigerator for up to 7 days.