It does not matter what type of cake, sponge or base product that you make for the Gateaux or Torte.
It does not matter what flavour cream or filling that is used.
It does not matter how it is decorated.
If it is manufactured from ingredients that are fit for human consumption then it can be used to manufacture the product.
The only other requirement is that you need to find customers that will purchase the product that you have made.
It is easier to sell a product if it can be linked to a festival season or event.
Seasonality and ethnic diversity also can be taken into account.