In a small bowl, whisk together the balsamic vinegar, Dijon mustard, olive oil, minced garlic, thyme, black pepper, and lemon juice. Add a small pinch of salt, if desired.
2 tbsp balsamic vinegar, 1 tbsp Dijon mustard, 1 tbsp olive oil, 1 clove garlic, 1 tsp thyme, ½ tsp pepper, ½ lemon, 1 pinch salt