Rouille

Directions

1. 1
   Soak the chiles in hot water to soften.
2. 2
   Meanwhile, put the yolk, lemon juice, mustard, and garlic in a blender or food processor and turn the machine on.
3. 3
   While its running, add the oil in a steady stream.
4. 4
   When an emulsion begins to form, you can add the oil a little faster.
5. 5
   Drain the chiles and remove their seeds; add them, along with the red pepper, and continue to blend until the mixture is smooth.
6. 6
   Add salt and cayenne if necessary (the rouille should be quite hot).
7. 7
   Taste and add more salt or lemon juice if you like.
8. 8
   Best served immediately, but keep it for a few hours if you must.