Pressing tofu helps extract liquid so it cooks up perfectly in this healthy Chinese tofu recipe. Look for plum sauce - a sweet-and-sour condiment - near other Chinese sauces in most supermarkets. Serve with steamed brown rice.
- Fold a kitchen towel in half and place on a cutting board. Cut tofu in half horizontally and set on the towel. Put another folded towel and a weight (such as a heavy skillet) on the tofu; let drain for 15 minutes.
- Meanwhile, whisk plum sauce, ketchup, soy sauce and rice wine in a small bowl and place near the stove.
- Cut the pressed tofu into 3/4-inch cubes and place near the stove.
- Heat 2 teaspoons oil in a large nonstick skillet over medium-high heat. Add scallions, garlic and ginger; cook, stirring, for 30 seconds. Add bok choy and cook, turning, until bright green, 1 to 2 minutes. Add water, cover and steam until tender, about 2 minutes. Transfer everything to a plate. Wipe the pan dry.
- Return the pan to medium-high heat, add the remaining 1 tablespoon oil and heat until shimmering. Add the tofu in a single layer. Cook, without stirring, until starting to brown, 2 to 3 minutes. Stir and continue cooking, stirring frequently, until brown on all sides, 6 to 8 minutes more. Add the sauce; cook, stirring, until the tofu is well coated, 1 to 2 minutes. Serve with the bok choy, sprinkled with sesame seeds.