Kimchijeon (kimchi pancakes)

Name: Kimchijeon (kimchi pancakes)
Prep time: 10 min
Cook time: 12 min
Total time: 22 min
Cuisine: Korean
Ingredients: 1 cup thinly sliced fully-fermented kimchi; 1 to 2 scallions (Two if thin and small); 1/4 medium onion; 3 ounces minced pork, canned tuna (without the liquid), or squid cut into small strips - optional; cooking oil with high smoke point for pan frying; 1 1/4 cups all-purpose flour or buchimgaru (Korean pancake premix); 2 to 3 tablespoons juice/liquid from kimchi (See note on water below); 1 or 2 teaspoons gochujang (Korean chili pepper paste) or gochugaru - optional; 1 lightly beaten egg - optional; 1 cup icy cold water; 1 tablespoon soy sauce; 1 teaspoon vinegar; 1 tablespoon water; 1/2 teaspoon sugar; pinch of black pepper