01 - In a small bowl, combine the ground flaxseed with 2 tablespoons of water. Let it rest for 5 minutes until thickened to a gel-like consistency.
02 - In a large mixing bowl, whisk together the all-purpose flour, chickpea flour, salt, and black pepper. Pour in the cold water and add the flax egg, stirring until you have a smooth, pourable batter with no lumps.
03 - Gently fold the chopped kimchi and sliced scallions into the batter until evenly distributed. Set aside while you prepare the mushrooms.
04 - Heat 1 tablespoon of vegetable oil in a large nonstick skillet over medium-high heat. Add the sliced mushrooms and sauté for 2 to 3 minutes until they begin to soften.
05 - Stir in the tamari, sesame oil, maple syrup, and rice vinegar. Continue cooking and stirring for about 2 more minutes until the mushrooms are well glazed and most of the liquid has been absorbed. Transfer to a bowl and wipe the skillet clean.
06 - Add another tablespoon of vegetable oil to the skillet and set heat to medium. Pour in half of the kimchi batter, spreading it into a large pancake about 1/2 inch thick. Cook for 3 to 4 minutes until the edges are golden and crisp. Flip carefully and cook for another 2 to 3 minutes on the second side. Repeat with the remaining batter, adding more oil if needed.
07 - Transfer the pancakes to plates and top with the warm tamari mushrooms. Garnish with additional sliced scallions.
08 - Whisk together the tamari, rice vinegar, maple syrup, toasted sesame oil, gochugaru if using, and toasted sesame seeds in a small bowl. Serve alongside the pancakes.