Step 1

In a large skillet over medium-high heat, melt the butter. Add the sliced onions, pepper flakes and salt, then saute until the onions are tender. Stir in the minced garlic.

Step 2

Reduce the heat to medium-low, and continue to cook, stirring occasionally, for 30 to 40 minutes or until the onions are a deep golden brown.

Step 3

Add the halved tomatoes, balsamic vinegar and 2 tablespoons of olive oil to the skillet.

Step 4

Cook the angel hair pasta according to the package directions. Drain the pasta, then toss it into the skillet with the other ingredients.

Step 5

Drizzle the pasta mix with the remaining olive oil, then add the bacon, Parmesan and pepper, and heat through. Before serving, garnish with basil or your fresh herb of choice, if desired.