Apple Cinnamon Cupcakes

INGREDIENTS

softened butter (110g)
caster sugar (110g)
2 eggs
self raising flour (110g)
1 tbsp ground cinnamon
a pinch ground nutmeg
a pinch ground allspice
4 cooking apples
1 tbsp brown sugar
a splash of water

Buttercream
butter, room temperature (150g)
icing sugar (300g)
a drop of vanilla extract
handful chopped pecan pieces