Directions

1. Halve tofu block lengthwise; slice each half into 8 rectangles. Arrange on a paper towel-lined baking sheet; top with more paper towels and another baking sheet. Weight with canned goods or a skillet. Refrigerate overnight or at least 20 minutes.
2. Transfer tofu to a shallow dish. In a bowl, whisk together soy sauce, vinegar, and sesame oil with 1 tablespoon water; pour over tofu. Marinate 5 minutes (reserve marinade).
3. Heat canola oil in a 12-inch nonstick skillet over high heat. Cook tofu until golden, 1 to 2 minutes per side. Set tofu aside.
4. Stirring constantly, cook onions in skillet over high heat until browned, 5 minutes. Add mushrooms; cook 2 minutes. Add red pepper and bok choy stems; cook 3 minutes. Add peas and ginger; cook 1 minute. Add marinade, cornstarch mixture, bok choy greens, and tofu. Cook until heated through. Season with soy sauce as desired. Serve with limes.