Custard Cream Hearts | Nigella's Recipes | Nigella Lawson

Ingredients

• 175 grams plain flour
• 3 tablespoons Bird's original custard powder
• 1 teaspoon baking powder
• 50 grams unsalted butter
• 50 grams vegetable shortening (such as Trex)
• 3 tablespoons caster sugar
• 1 large egg
• 1 tablespoon milk or more to bind
• 1 tablespoon Bird's original custard powder
• 100 grams icing sugar
• 50 grams soft unsalted butter
• 1 teaspoon boiling water