Foryoueats: Japanese Sweet Potato Okonomiyaki

Ingredients

• 1 cup plain flour
• ½ tsp baking powder
• ¾ cup vegetable stock
• 3 eggs
• 1 tbsp soy sauce
• 3 cups shredded Chinese cabbage (also called wombok or Napa cabbage)
• 100g (3.5 oz) sweet potato, peeled, coarsely grated
• ¼ cup finely sliced spring onions (scallions), plus extra to sprinkle
• ½ cup vegetable oil
• Japanese tonkatsu sauce* to serve
• Japanese Kewpie mayonnaise* to serve
• Nori flakes or nori furikake* to serve