In a bowl, mix 1/2 cream and yoghurt well
Sprinkle gelatin over cold water. Stir lightly. Rest for 5 to 10 minutes until spongy
In saucepan , dissolve sugar in remaining cream over low heat
Over low heat or microwave until gelatin dissolves completely
Add gelatin to sugar mixture and mix well. switch off
Add this to yoghurt mixture and mix well
Add lemon juice and whisk well
Pour in serving glass. Chill for 2-3 hours
Drizzle with honey and top with walnuts. Serve cold