Line a 22cm pie tin with pastry. Line with baking paper and rice and bake blind for 15 minutes. Remove and cool.
To make the salted caramel — In a small pot melt the butter, add the brown sugar, cream and salt. Bring to a steady boil for 8 minutes, add the vanilla then remove from the heat and cool.
When the caramel has cooled, spoon into tart base. Refrigerate until needed.
Before serving, top the tart with cream and sliced bananas. If it is to sit for a while, squeeze lemon over the bananas before topping with cream.