Tofu Reubens with Salad

Name: Tofu Reubens with Salad
Ingredients: 2 6-ounce packages baked tofu; 1/8 teaspoon ground allspice; 1/8 teaspoon mustard powder; 2 1/2 tablespoons unsalted butter; 8 slices seeded rye bread; 1/2 cup Russian or Thousand Island dressing; 1 cup sauerkraut, rinsed and drained; 4 slices Swiss cheese; 5 ounces mixed baby greens (about 6 cups); 2 tablespoons chopped cornichons or dill pickles, plus 1 tablespoon brine from the jar; 2 tablespoons pickled mushrooms (optional); 1 1/2 tablespoons extra-virgin olive oil