Heat 2 teaspoons oil in a small saucepan over medium heat. Add onion and cook, stirring, until soft and translucent, 4 to 6 minutes. Add broth, thyme, bay leaf and the fig-port mixture. Bring to a boil and cook until reduced by half, 10 to 12 minutes. Season with vinegar, 1/4 teaspoon salt and pepper. Set aside.