2. In a bowl, mix chicken or shrimp, water chestnuts, mushrooms, scallions, and sherry together.
3. Divide the mixture evenly in 6 custard cups.
4. In a separate bowl, beat together eggs, salt, and stock.
5. Pour the egg mixture into the custard cups.
6. Top with spinach or lettuce leaves.
7. Place in a pan with 3 inches boiling water.
8. Cover the pan and then bake for about 30 minutes or until set.