Friggone (Tomato Marmalade)

• 6 yellow onions, finely diced
• 4 ripe tomatoes, finely diced
• 3 tablespoons extra-virgin olive oil
• 1 tablespoon best-quality balsamic vinegar
• Salt and pepper

1. In a large, heavy-bottomed saucepan, combine the onions, tomatoes and oil and cook over medium heat, covered, for 1 hour.
2. Remove from heat, toss with the vinegar and salt and pepper, to taste, and serve as a condiment for bollito misto.

yellow onions, tomatoes, extravirgin olive oil, balsamic vinegar, salt

Taken from www.foodnetwork.com/recipes/mario-batali/friggone-tomato-marmalade-recipe.html (may not work)