Preheat the oven to 180C/350F/Gas 4.
Melt the butter and sugar together in a saucepan and stir until the sugar has dissolved. Add the banana and lemon juice and stir well to coat.
Spoon the banana into a small gratin dish and scatter over the gingerbread crumbs. Place into the oven and bake for ten minutes, or until the top is golden-brown and crisp.
Serve with a dollop of clotted cream.
