In a large pot of boiling salted water, cook the pasta until al dente. Drain well and toss with 1 tablespoon of the extra-virgin olive oil.
In a saucepan of boiling salted water, blanch the water chestnuts for 1 minute. Drain and slice 1/4 inch thick.
In a large bowl, mix the remaining 1/3 cup of olive oil with the scallions, lemon juice and garlic. Season with salt and pepper. Add the pasta, frisée, tuna and the water chestnuts or apple; toss well and serve.
Wine Recommendation: The rich, meaty tuna and chewy pasta in this salad call for a flavorful dry white with body. The sharp greens and tangy dressing suggest a citrusy bottling such as the 2000 Argiolas Vermentino Costamolino or the 2000 Cantina del Vermentino Vermentino di Gallura Funtanaliras.