Preheat oven to 180 C / Gas 4. Generously grease baking trays. Butter the undersides of five small bowls or ramekins.
Sift together flour and ginger.
In a small saucepan over medium heat, combine butter, sugar and syrup and cook until butter is melted. Allow to cool.
Stir flour mixture and lemon zest into syrup. Drop by spoonfuls onto prepared trays, well spaced apart, as the mixture will spread.
Bake 10 to 15 minutes in preheated oven, until golden. Remove from oven and let cool 1 minute. Gently lift the sugar rounds off the tray and bend it over a bowl to shape. Remove baskets when cool and allow to set fully before filling.