Tortellini al Forno with Radicchio and Goat Cheese

• 3 tablespoons extra virgin olive oil
• 1 medium red onion, sliced paper thin
• 2 heads radicchio Treviso, cut into 1/2-inch pieces
• 1 recipe goat cheese tortellini (see below)
• 2 cups salsa balsamella (see below)
• 1/2 cup parmigiano reggiano

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extra virgin olive oil, red onion, radicchio treviso, recipe goat cheese tortellini, salsa balsamella, parmigiano reggiano

Taken from www.foodnetwork.com/recipes/mario-batali/tortellini-al-forno-with-radicchio-and-goat-cheese-recipe.html (may not work)