For the custard (quantities are for about 4 to 6 tartlets):
- Bring the milk to the boil, then beat the egg yolks and sugars together. Add cornflour and mix well. Add the boiling milk to the mixture and stir well.
- Return to low heat, until thickened. Allow to cool before using.
- Shortly before serving, garnish tart shells with crème pâtissière and top with wild strawberries.