Cut the wallaby fillets into 2cm dice, wash the wallaby and drain in a colander. Place the wallaby in a pot with cold water and bring to boil, once it simmers strain and wash the diced wallaby again. This ensures you get a nice white sauce at the end.
Sauté the vegetables in the butter and add the bay leaf and fresh thyme until fragrant, add the blanched wallaby. Pour in the white wine and reduce by 2/3, then add the water or stock and bring to a simmer.
Finish the sauce by adding thickened cream and simmer until a nice viscosity.