Trim the shiitakes & set aside. Press the tofu for 30 minutes & cube. Quarter the cucumbers lengthwise & cut into 1 1/2 inch lengths. Chop the bell pepper.
Heat oil in a wok over medium-high heat. Add the tofu & carefully stir fry until the colour changes. Remove the tofu & add the garlic. Stir fry until the colour changes. Add all the vegetables to the wok & stir fry for 2 minutes. Add all the seasonings & continue to stir fry for 3 to 5 minutes. Serve garnished with green onions.