Cold Udon with Kimchi and Tofu

Name: Cold Udon with Kimchi and Tofu
Ingredients: 1 14-ounce package extra-firm tofu, drained and cut into 8 slices; Kosher salt and freshly ground pepper; 2 tablespoons vegetable oil; 1 cup kimchi, sliced into thin strips, plus 3 tablespoons brine; 4 teaspoons toasted sesame oil; 1 tablespoon soy sauce; 1 tablespoon sugar; 1 teaspoon distilled white vinegar; 1 8-ounce package dried udon; 4 cups mesclun greens; 1 small Asian pear, peeled and thinly sliced; 4 teaspoons toasted sesame seeds