Beets and Caramelized Onions with Feta

From: http://www.epicurious.com/recipes/food/views/Beets-and-Caramelized-Onions-with-Feta-108478
Serves: 4

• 2 tablespoons cider vinegar
• 1 teaspoon Dijon mustard (preferably whole-grain or coarse-grain)
• 1/4 teaspoon black pepper
• 3/4 teaspoon salt
• 3 tablespoons olive oil
• 2 (15-oz) cans small whole beets, drained and quartered (or halved if very small) * I boiled 3 beets until they could easily be pierced by a fork.
• 3 oz crumbled feta (1/2 cup)
• 1/4 cup pine nuts (1 oz), toasted and coarsely chopped

Whisk together vinegar, mustard, pepper, and 1/2 teaspoon salt in a large bowl, then add 3 tablespoons oil in a slow stream, whisking until combined well.  Add beets and cheese to dressing, stirring gently to combine. Serve sprinkled with pine nuts.