Caramelized Onion and Blue Cheese Orzo

1 pound uncooked orzo pasta

2 tablespoons butter

3 tablespoons olive oil

4 onions, sliced

6 ½ ounces blue cheese, crumbled

3 ½ ounces mascarpone cheese

2 cups shredded spinach

salt and pepper to taste

Bring a large pot of lightly salted water to a boil. Add pasta and cook for 8 to 10 minutes or until al dente; drain.

While pasta is cooking, heat butter and oil in a large skillet over low heat. Cook onion in this mixture until golden brown, 20 to 30 minutes. Remove from pan with a spoon and drain on paper towels.

In a large bowl, combine blue cheese, mascarpone and onion and mix well. Toss cheese mixture with spinach and pasta, season with salt and pepper and serve.