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 the prepared flax egg, then mix 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 coated in a glossy glaze and most of the liquid has been absorbed. Transfer the mushrooms to a bowl and wipe the skillet clean.
06 - Add another tablespoon of vegetable oil to the skillet and set it over medium heat. Pour in half of the kimchi batter, spreading it into a large pancake about ½ inch thick. Cook for 3 to 4 minutes until the bottom is golden and the edges are crisp. Flip carefully and cook for another 2 to 3 minutes until both sides are evenly browned. Repeat with the remaining batter, adding more oil if needed.
07 - Transfer the pancakes to serving plates, top generously with the warm tamari mushrooms, and sprinkle with additional sliced scallions for garnish.
08 - In a small bowl, whisk together the tamari, rice vinegar, maple syrup, toasted sesame oil, gochugaru if using, and toasted sesame seeds until well combined. Serve alongside the pancakes.