Cut broccoli into 1 1/2 inch florets. Peel stems and cut in half lengthwise and cut into 1/2 inch thick slices on the diagonal.
Combine balsamic vinegar, garlic, olive oil, 1/2 teaspoon salt and 1/4 teaspoon pepper in a bowl, whisking well.
Add 1/2 tsp salt to a pot of boiling water. Add broccoli stems to the pot and cook for 2 minutes. Add broccoli florets to the pot and cook for another minute, or until bright green. Rinse and drain. Combine the broccoli, sun dried tomatoes, pine nut, and balsamic mixture; toss well.
Sprinkle 1/4 teaspoon each of salt and pepper on broccoli mixture; drizzle with Champagne vinegar.