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1
Place mushrooms in a small heatproof bowl. Pour over enough boiling water to cover, and let soak for 15 to 30 minutes. Remove the mushrooms from the water and squeeze dry, then thinly slice. Reserve 1/2 cup of the mushroom soaking liquid.
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2
Heat oil in a wok or large skillet over medium-high heat. When you start to see wisps of smoke, add the tofu, celery, carrots, bamboo shoots, scallions, and a pinch of salt. Stir-fry for 3 to 5 minutes, or until the mixture is fragrant and the vegetables are beginning to soften. Add the mushrooms, reserved mushroom soaking liquid, hoisin sauce, soy sauce, vinegar, sesame oil, salt, and chili flakes, and cook for another 1 to 2 minutes, or just until the liquid is bubbling. Whisk together the cornstarch and water to form a slurry, then stir the slurry into the filling mixture. Cook for another 30 seconds to a minute, or just until the sauce thickens and there is no more liquid bubbling in the pan. Remove the filling from the heat and let cool completely.
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3
Preheat the oven to 400u00b0 F, and lightly grease a baking sheet. Remove the wrappers from their packaging and place under a clean kitchen towel. Drain off any excess liquid from the cooled filling. Working one at a time, remove a wrapper from under the towel, place about 2 tablespoons of filling in the middle, and roll the wrapper around the filling, folding in the sides as you go. Use your finger to dab a little bit of water on the pointed end of the wrapper before you finish rolling, to seal the egg roll closed. As you finish rolling the egg rolls, place them under plastic wrap or another clean kitchen towel to keep them from drying out.
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4
Lay the egg rolls on the baking sheet, seam-side down, and brush the tops with peanut oil. Bake for 10 to 15 minutes, or until starting to brown on top; flip the rolls over, brush the other side of each roll with peanut oil, and bake for another 10 to 15 minutes, or until golden and crisp on both sides. Remove from the oven and let cool for about 5 minutes before serving.
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5
You can freeze the cooked, cooled egg rolls for up to a month. Just lay them out in a single layer on a baking sheet and place in the freezer until frozen solid, then transfer to a zip-top bag. Reheat the frozen egg rolls in a 350u00b0 F oven.
