Cabbage: cut it into rough pieces about 3 cm across and dry it well. Do not shred it finely, which is what makes the pancake soggy.
Batter: thick but pourable. If it looks loose and will not hold together, beat in another egg before it goes in the pan.
Do not press it down. Osaka style stays tall and airy; flattening forces the air out. Pressing belongs to Hiroshima style, where the layers need to bond.
Doneness: the prawns are raw in the batter and the bacon starts raw on top, so cook until the prawns are pink and opaque and a skewer in the thickest part comes out clean and hot.
Swaps: squid or thinly sliced pork belly in place of the prawns, or leave out the seafood and bacon for a vegetarian version. No sweet soy sauce? Use soy with a little honey. No mirin? Honey with a splash of rice vinegar.
Leftovers: cool without toppings, then 3 days in the fridge or a month in the freezer. Reheat in a hot oven rather than a microwave, which costs you the crust.
About the nutrition. The figures cover one pancake as the recipe makes it. The mayonnaise and katsuobushi on top carry no quantity here, so they are not counted - a generous squeeze of Kewpie adds a good deal.