Cut tofu into four slabs and place on a thin cotton towel or piece of cheesecloth to drain. Slice salmon fillet into eight slices, each about 3/4inch thick. Place two salmon strips skin side together in a round, yin yang patty and place on top of each piece of tofu.
In a small saucepan, bring to a boil the soy sauce, mirin, rice wine vinegar, ginger, and black pepper. Remove from heat and reserve.
Place a rack above boiling water in a large pot with a cover. Place tofu/salmon on rack in steamer, surround it with the spinach, and steam, covered, for 4 to 6 minutes.
To serve, place a tofu/salmon in each of four shallow bowls and arrange hot spinach around edges. Pour soy mixture over each and sprinkle with scallions and sesame seeds. Serve immediately.
c.1997, M.S. Milliken & S. Feniger, all rights reserved