Preheat the oven to 200C/400F/Gas 6.
To make the cake, line a small baking tray with greased baking parchment
Place the butter, sugar and egg into a food processor and blend together.
Add the self-raising flour and baking powder and blend again to make a cake batter. Use a spatula to transfer the mixture into the lined baking tray.
Place the pineapple slices on top and sprinkle over the extra caster sugar.
Place in the oven and bake for 12 minutes, or until cooked through and golden.
To make the sweet chilli drizzle icing, place the honey, lime juice and chilli into a frying pan over a medium heat. Simmer the mixture for five minutes, until thickened to a syrup.
To serve, place the cake on a large plate and drizzle over the sweet chilli drizzle icing.