Blanch the green beans and set them aside to cool. Mix together dressing ingredients and set aside.
Heat butter over medium-high heat and add tomatoes, onion and garlic. Saute until tomatoes soften and onions become translucent. Remove from heat and let cool slightly.
Combine green beans and tomato mixture and toss gently with the dressing. Top with goat cheese crumbles and fresh cracked black pepper.