Cut the tofu crosswise into 4 slices and let the slices drain between a double thickness of paper towels for 20 minutes. While the tofu is draining, in a small bowl dissolve the cornstarch in 1/4 cup of the water and stir in the remaining 3/4 cup water, the soy sauce to taste, the vinegar, the Scotch, the Sugar, and the salt. Serves 2.