Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      medium        red onion -- thinly sliced
   2      tablespoons   virgin olive oil
   2      cups          basic tomato sauce -- see * note
   8      ounces        fresh tuna -- cut 1/2" cubes
   2      tablespoons   fresh rosemary leaves
   8      ounces        fresh tagliatelle
     1/4  cup           finely-chopped Italian parsley
                        salt -- to taste
                        freshly-ground black pepper -- to taste

Preparation:

* Note: See the "Basic Tomato Sauce" recipe which is included in this collection. Bring 6 quarts water to boil and add 2 tablespoons salt. In a 12-inch skillet, cook sliced onion in 2 tablespoons olive oil over medium heat until wilted, about 3 to 4 minutes, add Basic Tomato Sauce and bring to a boil. Add tuna and rosemary, return to boil and remove from heat. Season with salt and pepper. Drop tagliatelle into boiling water and cook until just al dente (about 1 minute). Strain in colander over sink and toss into pan with tuna sauce. Toss, stirring carefully over medium-high heat to coat noodles. Add parsley, stir in, pour into warm serving bowl and serve immediately. Source: MOLTO MARIO with Mario Batali From the TV FOOD NETWORK - (Show # MB-5631)