Pat the tofu dry and add it to a large mixing bowl. Drain the black mushrooms and finely slice them. Add to the mixing bowl. Add the grated carrots and chopped vermicelli as well.
Add the green onions, sugar, ground black pepper, and salt. If using, add the chopped ginger and mushrooms seasoning (optional). Using your hands (or a large spatula, although hands work best) mix everything together and mash the tofu with the other ingredients into a thick paste. Taste and adjust seasonings if needed. At this step feel free to add your favorite spices.
Bring a medium pot of water to a boil. Once boiling, add the green onion stalks and cook for about 1 minute. Drain and set the green onions aside, we will use them to close our wontons.
Take two egg rolls wrapper stacked together (using two instead of one yields a more flaky crust, and the wontons hold together better) and place about 3 tablespoons of the tofu filling in the center. Enclose the filling, shaping the wrapper into a "pouch" shape (see photos). Press firmly to mark the shape. Using a stalk of green onion, tie the wonton, wrapping the green onion stalk twice around the wrapper, finishing by a double knot. Be careful not to pull too much or you might break it. Repeat with the remaining wrappers and filling.
Heat the oil in a deep saucepan over medium heat. Test if the oil is hot enough by dipping a wood chopsticks into it, if you see bubbles forming around the chopsticks, the oil is hot enough. Fry the wontons, 2-3 at a time, for about 5 minutes, or until golden brown. Stir regularly to make sure they brown evenly. Carefully remove from oil and transfer to a place lined with kitchen paper towel to remove excess oil. Repeat with the remaining wontons.
Sweet & Sour Sauce
To a saucepan, add the minced garlic, chili, sugar, white vinegar, sweet chili sauce, salt, and water. Bring to a boil, lower the heat and let simmer for about 5 minutes, or until the sugar has dissolved.
Dissolve the cornstarch in 3 tablespoons of water. Add to the saucepan and cook for 1 more minute, stirring frequently until the sauce has thickened. Remove from heat and transfer to a bowl.
Serve the wontons warm with the dipping sauce! Another option is to add the sauce and the wontons to a skillet and cook for a couple of minutes to coat the wontons with the sauce.
Wontons will keep for up to 2 days in the refrigerator. Reheat in a 350°F (180°C) preheated oven for about 10 minutes.
Video
Notes
* If you can't find round wrappers, simply recut square ones.