Cousin Isabelita's Stuffed Aubergines

My cousin Isabelita, visiting from Spain , made me this delicious Stuffed Aubergines

Two aubergines
Good quality minced beef or minced beef and minced pork and minced lamb.
Salt, pepper.
Béchamel sauce: Milk, butter, flour, ground nutmeg, salt and pepper.
Onions
Cheese: parmesan or mature cheddar.
 
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Instructions:

1. Cut off the stalks of two aubergines and cut lengthways.
2. Put into pot with cold water.
3. Add salt.
4. Bring to boil.
5. Boil until soft enough: test by inserting fork and when the fork can be withdrawn easily, it is ready.
6. Remove aubergines and drain.
7. Heat frying pan, add olive oil and chopped onions.
8. Fry onions until soft.
9. Add minced beef to frying pan.
10. Remove insides of aubergines and mix this with beef and onions.
11. Add grated cheese (any type) to mixture.
12. Re-insert mixture into aubergine shells.
13. Add Béchamel sauce
14. Add grated cheese on top of aubergines.
15. Place aubergines into oven proof individual dishes.
16. Place dishes into hot oven, top shelf.
17. Cook until browned over.

Wine: I suggest a red: choose from  Malbec, Cabernet Sauvignon, Merlot and Zinfandel