1. Stir the ingredients together in a non-reactive saucepan - so stainless-steel or glass, but not aluminium)
2. Heat this over a low heat until it is warm, but not in any way hot.
3. Pour into a very clean bowl or jar and leave this at room temperature until it sets - this may take a few hours.
4. Refrigerate until needed.
The finished crème should keep as long as the dates on the cream used.