1 cup water
1 tbsp vegetable oil
1/2 cup salt
1 tbsp cream of tartar (this is the preservative)
1 cup flour
Put all the ingredients except the flour into a saucepan and heat until warm, stir to mix the ingredients well.
Remove from the heat and add the floor, stir until it forms a ball then tip it out onto the work surface. Leave it to cool, whilst it is cooling, mix up the next batch.
Once it has cooled you need to knead until smooth.
For those in Japan, I used the food colour from the supermarket, it is in a tiny jar and powder, not liquid, I used about 1/3 teaspoon to make the doh in the last post, it is really strong and much more vibrant than the food colour from home.