- In an oven or toaster oven, toast rolls whole then cut in half. In a bowl, combine arugula, onions, olive oil, salt, and pepper.
- Evenly divide horseradish-Dijon on both halves of the rolls. On the bottom halves, layer with meat, then the greens/onions mixture. Combine with top halves and cut in half to serve.
Horseradish-Dijon / Combine all ingredients and mix well.
Red Wine Pickled Onions / Bring all liquid ingredients to boil. Mix all spices, except bay leaf and chile, and toast. Remove from oven and pulverize in a spice grinder, then add to the liquid mixture. Add the bay leaf and chile. Remove from heat. Place onions in an airtight container and top with pickling liquid. Place lid on top, refrigerate, and allow to sit for a minimum of 1 week.