Korean Seafood Pancake (Haemul Pajeon)

Ingredients

• ½ cup plain flour or buchimgaru (Korean pancake flour)
• ½ cup tempura flour
• 2 tbsp potato starch
• ½ tsp salt
• 1⅓ - 1½ cup water
• 8 green onion stalks, sliced 3-5 cm length
• 1 cup mixed and cleaned seafood (e.g. calamari, prawns)
• 1 egg, lightly beaten
• 2 tbsp onions, finely diced (optional)
• 1 long red chilli, sliced (optional)
• 2 tbsp zucchini, finely diced (optional)
• 6 tbsp canola oil
• 2 tbsp soy sauce
• 1-1½ tbsp vinegar
• ¼ tsp Korean chilli powder/gochugaru (optional)
• ½ tbsp chopped green onions (optional)