A La King Sauce

Directions

1. 1
   In a large heavy-based saucepan, melt the butter over medium heat.
2. 2
   Add green and red pepper strips and saute gently for 1 to 2 minutes.
3. 3
   Add the mushrooms; saute over low heat until the peppers are soft.
4. 4
   Add the flour, salt and pepper, then blend.
5. 5
   Warm milk and pour into saucepan all at once, using a whisk to produce a smooth sauce.
6. 6
   Bring sauce to a boil.
7. 7
   Stir a little of the hot sauce into the egg yolk.
8. 8
   Add sherry, if desired.
9. 9
   Serve hot.