1.
Season chicken breasts with ground white pepper and salt and brown in oil and 1 tablespoon butter. Remove chicken and set aside.
2.
Add onion and brown. Add mushrooms and cover on medium heat for 3 minutes. (Add some more butter if the onions or mushrooms are starting to stick.)
3.
Add flour and stir continuously for 1 minute.
4.
Add wine, broth, lemon juice, remaining butter and tomato paste. Bring to boil.
5.
Reduce heat and add chicken back to pan simmer on low heat for 10 minutes.
6.
Season with salt and pepper.