1.Put the purees in a pot over low heat to warm up.2.Whisk the sugar and egg yolks together.3.Gradually stir the sugar and yolk mixture into the warm puree to make a creme Anglaise.4.Slowly cook the creme Anglaise to 80 - 82℃,mixing constantly.5.Remove from the heat and add the gelatin mass.6.Cool don to 40-45℃,then add the buttrer and emulsify with a hand blender.7.Cast on top of the frozen blackberry compote and the freeze