Blueberry puffs

1. Preheat the oven to 400 °F. Sprinkle the lemon juice on the berries and use the berry mixture to fill 6 custard cups 2/3rds full.
2. Sifti the next 3 ingredients together, and set aside.
3. Work the shortening with a spoon until creamy.
4. Gradually add the sugar, working until light.
5. Beat in the egg and flavoring with a spoon.
6. Add the flour mixture and milk all at once, stirring to mix. Spread on the berries.
7. Bakei in a moderately hot oven, 400 °F. , for 30 minutes or until done.
8. To serve: turn out with the berry side up.
9. Serve warm, with heavy cream or vanilla ice cream.