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1
Drain tofu and cut each piece into 4 squares; cut each square diagonally into 2 triangles. Set tofu triangles aside.
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2
Place shiitake mushrooms into a bowl of hot water and allow to rehydrate until moist and plump, about 20 minutes. Cut out woody stems and finely chop mushrooms.
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3
Place zucchini, onion, garlic, and jalapeno pepper into a food processor and process until the vegetables are almost a paste; transfer to a bowl and stir in shiitake mushrooms, egg, soy sauce, ginger, cornstarch, and hoisin sauce. Fold shredded cabbage into the stuffing.
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4
Heat 2 tablespoons vegetable oil in a large skillet over medium heat. Pat tofu triangles dry with paper towels and pan-fry in the hot oil until browned on all sides except 1 narrow side for stuffing, 2 to 3 minutes frying time per side. Remove tofu triangles and let cool until you can handle them.
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5
With a sharp paring knife, cut a slit into the unbrowned side of a tofu triangle; scoop out center of the tofu with a grapefruit spoon, leaving the walls of the triangle about 1/4-inch thick. Use a spoon to fill each triangle generously with the stuffing, letting stuffing mound out of the tofu piece.
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6
Heat remaining 2 tablespoons vegetable oil in skillet over medium heat; place tofu triangles, stuffing sides down, into the hot oil and pan-fry until stuffing edge is browned and stuffing is hot and set inside, about 5 minutes. Turn triangles on their sides and refry for a minute or two in the hot oil to rewarm.