Make the mousse when you are ready to assemble the cake
In a thick bottomed saucepan , measure out the milk , sugar , thandai syrup and agar agar powder .
Mix well
Over medium heat , bring to a boil while stirring constantly.
Continue heating for another minute and then take off heat. Strain if needed. You want this mixture warm ( not hot ) to mix into the cream
As the mixture becomes warm, in another bowl, whip your cream until you have firm peaks ( the cream shouldn't move when the bowl is upturned)
Continue whipping / beating the cream , as you add the warm mixture continuously into it .
Once all the mixture is added into the cream , mix well with a spatula to make sure the mousse is uniform