Name: Ultimate ginger biscuit
Prep time: 20 min
Cook time: 13 min
Yield: 16
Cuisine: American
Ingredients: 315g plain flour; 1 tsp bicarbonate of soda; 2 tsp ground cinnamon; 1 1/2 tsp ground cloves; 1/2 tsp ground nutmeg; 1/2 tsp ground ginger; 1/4 tsp salt; 225g dark brown sugar, lightly packed; 60ml vegetable oil; 75ml unsulfured treacle; 1 extra-large egg, at room temperature; 170g chopped crystallized ginger; Caster sugar, for rolling the cookies