Caramelized Brussels Sprouts with Pistachios

I had never tried Brussels sprouts before I tasted this recipe, and immediately wondered why everyone hates them

Ingredients:
4 pounds Brussels sprouts
1/2 Cup unsalted butter
4 small red onions, cut into strips
1/4 Cup red wine vinegar
2 Tablespoons white sugar
salt and pepper to taste
1/2 cup coarsely chopped pistachios

Directions:
1. Place Brussels sprouts in a steamer basket over boiling water. Cover saucepan and steam 8-10 minutes or until Brussels sprouts are tender yet crisp.
2. Melt the butter in a deep skillet, add the onions and 3 tablespoons vinegar; cook until onions brown.
3. Add the Brussels sprouts, sugar and remaining vinegar. Saute over medium heat until the Brussels sprouts are lightly caramelized.
4. Season with salt and pepper to taste and garnish with pistachios.