Tuna With Pasta And Frisée

Name: Tuna With Pasta And Frisée
Ingredients: 1/2 pound pasta such as fusilli, quadrefiore or radiatore; 1/3 cup plus 1 tablespoon extra-virgin olive oil; 8 large, fresh water chestnuts, peeled, or 1 small Granny Smith apple, peeled and cut into 1/2-inch chunks; 4 large scallions, thinly sliced; 1/4 cup fresh lemon juice; 3 garlic cloves, minced; Salt and freshly ground pepper; 6 cups (packed) chopped frisée (10 onces); 1 jar (8 to 10 ounces) imported tuna packed in olive oil, drained and broken into large chunks with a fork