Drain daikon radish in a strainer and press out the extra juice. Do NOT throw away this cooking liquid. Reserve this radish cooking liquid as you will use this later.
Place the drained and cooked daikon back into the wok or large frying pan with the heat off. Season the cooked daikon with vegetable or chicken powder (vegetable bouillon cube crushed), sugar, salt, white pepper and five-spiced powder. All the water should be evaporated. Check the seasoning and add more salt or vegetable powder, if you want it more savory. Add more white pepper, if you like it more spicy. If your daikon is extra strong, add more sugar to taste. (FYI- every type of white radish has a little different flavor profile)
Add the cornstarch to the rice flour in a bowl and mix well. This is the dry mixture for the cake. Set aside.In a separate bowl, add the mushroom soaking liquid from the dried mushrooms to the reserved diakon cooking liquid. You should have about 2 cups of liquid. If you do not have 2 cups of liquid, add a little more water to make 2 cups of total liquid. This is the wet mixture for the cake. Set aside. Place your Cooked and seasoned daikon radish mixture back on the stove burner and place on very low heat.
Add a spoonful at a time of the rice flour and cornstarch DRY mixture with a couple of tablespoons of the reserved daikon water and mushroom water WET mixture a little at a time, to the daikon mixture, stirring continuously. Make sure it is well incorporated and has NO lumps. Repeat this procedure until all of the DRY mixture has been mixed in the cooked daikon with adding a little bit of the WET mixture. Stirring well with each addition. You may need all or a little less of the WET mixture to get to the desired consistency of thick oatmeal. A good parameter for checking the perfect consistency is to run your spatula at the bottom on the pan. If the daikon batter leaves a line on the bottom and starts to slowly return to the bottom of the pan. its perfect. Every daikon radish can be a little different as far as water content. In addition, your environment may be either more humid or dry. This procedure allows you to get the right consistency for your environment. We were taught this method in Hong Kong and it really is the best method. This procedure takes a few minutes but it is the best way to determine how much liquid is needed to het to the right wet cement consistency. We ended up using a total of 1 and ¾ cup of the WET mixture. You may need to add more or less. Turn the burner off. Stir in the aromatic sautéed Mushroom mixture to the diakon cake mixture.
Either a 9 inch cake pan or 8 x 8 pan are both okay for this recipe. Oil your cake pan or square pan and line the bottom with parchment paper. Scoop the batter into the cake pan and level it and smooth out the batter. (If your steamer is small, divide diakon batter into 2 smaller pans)
Do not worry if you do not have a "big fancy steamer". You can use your wok and place 2 chopsticks at the bottom of your wok in an "x" formation, then place a small plate of top, carefully add water to the bottom of your wok about 2 inches or so on the bottom, then place your daikon cake dish on top of plate and then place a lid on top of your wok and steam.
Alternatively if you do not have a wok, there is always plan B for steaming. I use my big soup pot that has a lid. It is very deep but not very wide so I have to split my daikon batter into 3 smaller ovenproof round dishes. I place a very small oven proof round dish upside down on the bottom of my soup pot, then I place my small bowl or daikon batter on top of the upside bowl so the weight of it holds down the upside down bowl. Then I carefully pour my water inside my soup pot about 2 inches on the bottom without getting any on my daikon radish cake. I then place a lid on my soup pot to cover and steam the radish cake.
Steam over high heat for approximately 55 minutes - 1 hour or until a toothpick or chopstick comes out clean. If your steamer lid has small holes or does not fit snug - now worries, just make sure to keep adding water to the steamer area so that your pan does not burn. Carefully remove steamed radish cake from the steamer and allow to cool to room temperature.
Then place the cake to cool in the refrigerator overnight. This is best so it is easier to cut.
Make your dipping sauce. In a small bowl add soy sauce (tamari), black Chinese vinegar, garlic, chili and freshly grated ginger, stir and set aside.
Slice cake into slices about 16 to 18 per cake. (Be sure to have a glass of water and a towel near by as with each and every cut you will put your knife in the water and clean with the towel. This helps prevent sticking.) If you have a an iron skillet, this promotes the best char on the Chinese vegan radish cake. However, if you do not have an iron skillet, just use a non-stick skillet.Put a little cooking oil in your iron skillet or frying pan and place the sliced daikon cake into the frying pan. Brown the daikon cake lightly on both sides (about 2 minutes each side) until golden brown. Garnish with green onions and serve with dipping sauce, Sriracha or our Homemade Sichuan Garlic Chili Oil . Serve hot and enjoy!