Chicken With Balsamic Vinegar

Sauté chicken in 1 T butter and 1 T oil; sprinkle with salt & pepper. Remove when done. Sauté onions few minutes. Add vinegar and bring to boil. Boil 3 minutes, or until reduced to a glaze, stirring. Add broth and boil until reduced to 1/2 cup. Add spinach and dried tomatoes. Remove pan from heat, whisk in 1 T butter. Serve over chicken, and top with chopped tomato. (Serves 3