A'right, mates; hope ye're hungry:
* 1 (10-12 ounce) beef tenderloin or beef medallions
* coarse salt
* fresh coarse ground black pepper
* 2-3 tablespoons butter
* 1-2 large shallots, minced (about 1/3 cup)
* 3/4 cup sliced mushrooms
* 1/2 tablespoon sugar
* 1/2 tablespoon red wine vinegar
* 2 large garlic cloves, minced
* 1/2 teaspoon dried thyme
* 1/2 teaspoon dried rosemary
* 1/2 tablespoon flour
* 3/4 cup beef broth
* 3/4 cup good quality dry red wine
1. Start by cutting the tenderloin into 6 equal pieces, then flatten each piece using a mallet or heavy weight until each piece is 1/4 inch thick.
2. Season with the salt and pepper.
3. In a medium skillet, melt a tablespooon of butter over med-high heat.
4. Add the beef, in batches if necessary, and saute until outside is brown but inside is still very pink, about 2 minutes on each side.
5. Add remaining butter to skillet, and when melted, add mushrooms and shallots.
6. Saute until tender, about 10 minutes. Sprinkle the sugar over the mixture, and cook until deep brown, about 4 minutes longer.
7. Add vinegar, garlic, herbs, and flour and stir one minute, until liquid is absorbed.
8. Add broth and wine, and bring to a boil.
9. Cook until liquid is thickened and reduced to about 1/2 cup. (or until it's thick enough to leave a "trail")
10. Return beef to the pan, and heat through, about 1 minute.
11. Arrange beef on plate and spoon sauce and mushrooms over.
PS - I'm too lazy to get a photo today