Weigh all Stage 1 ingredients into a small stainless steel bowl and place into a saucepan of boiling water (double boiler/bain marie). Bring up to a temperature over 75°C.
When the Stage 1 is over 75°C, weigh and add the Stage 2 ingredients together in a separate larger stainless steel bowl. Swap the bowls over so that the larger bowl is in the double boiler, make sure the temperature is over 75°C . Pour the Stage 1 ingredients into the larger bowl (Stage 2) and stir gently without creating air bubbles.
Check the temperature is over 75°C and continue to stir for 5 minutes. After 5 minutes, remove the bowl from the double boiler and put it into a pan of cold water to cool down quickly. Keep stirring all the time.
When the cream is under 40°C, add the remaining Stage 3 ingredients. Combine thoroughly, jar and label.