Floating Island

INGREDIENTS:
for the custard

1 tbsp of cornflour
a tub of natural yoghurt (500g)
4 egg yolks
caster sugar (100g)
2 shots of Limoncello
½ a vanilla pod

for the caramel

caster sugar
water
a shot of vegetable oil

for the meringues

4 egg whites
caster sugar (100g)
a handful of sugar coated almonds or peanuts, chopped