To make the sauce fry the onions in oil until soft.
Add the ginger paste, garlic paste, turmeric, curry powder, salt and sugar, stir to coat the onions.
Add the stock and coconut milk and simmer on low whilst you get started on the seitan.
In a large mixing bowl add all of the seitan ingredients and mix until a ball is formed.
Knead the dough on a floured surface for 1 minute, roll into a ball.
Cut the ball into 4 equal pieces and flatten and stretch each piece into a cutlet shape.
Get four pieces of tin foil big enough to fit the seitan pieces in to fold into a parcel.
Oil the foil and wrap the pieces up individually into a parcel.
Add the foil parcels into a steamer and steam for 20 minutes.
Once steamed remove the seitan from the foil and leave to cool whilst you set up the breading station.
Grab two shallow bowls and add the panko breadcrumbs to one and mix the flour and water in the other.
Dip each seitan into the flour, coat in breadcumbs and shallow fry until golden.
At this point you can blend your curry sauce or leave it unblended if you like.
Serve the katsu cutlet on a bed of rice and drizzle on your curry sauce!