|
2 teaspoons butter, divided
|
|
1 cup vertically sliced yellow onion
|
|
1 cup vertically sliced red onion
|
|
1/4 cup sliced shallots
|
|
3 garlic cloves, minced
|
|
1/2 cup fat-free, lower-sodium beef broth
|
|
2 cups green beans, trimmed
|
|
2 tablespoons balsamic vinegar
|
|
1/4 teaspoon salt, divided
|
|
|
|
4 (4-ounce) beef tenderloin steaks
|
|
1/4 teaspoon freshly ground black pepper
|
|
Cooking spray
|
|