Date banana rum loaf

Name: Date, banana & rum loaf cake
Ingredients: 250g pack stoned, ready-to-eat dates; 2 small or 1 large banana (140g/5oz in weight); 100g pecans, 85g/3oz roughly chopped, rest left whole; 200g raisins; 200g sultanas; 100g fine polenta; 2 tsp mixed spice; 2 tsp baking powder (use gluten-free if needed); 3 tbsp dark rum; 2 egg whites; a few banana chips and 1 tsp sugar (optional), to decorate