1 whole head of garlic (with about 12 to 14 cloves)
6 teaspoons olive oil, divided
1 pound penne
8 ounces bacon (about 8 slices), cut crosswise into 1/3-inch-wide strips
1 large onion, chopped (about 2 cups)
1 cup low-salt chicken broth
6 cups (packed) coarsely torn Treviso, Chioggia, or Tardivo radicchio leaves (from about 2 medium heads)
3 cups (packed) baby spinach leaves, torn in half (about 10 ounces)
1 cup (packed) fresh basil leaves, torn in half (about 10 ounces)
1 cup freshly grated Parmesan cheese plus additional for serving
1/4 teaspoon dried crushed red pepper
Preheat oven to 375°F. Cut off top 1/2 inch of garlic head, exposing cloves. Place garlic head, cut side up, on sheet of foil and drizzle with 1/2 teaspoon olive oil. Wrap garlic in foil. Roast until garlic is soft, about 40 minutes. Let stand until cool enough to handle. Squeeze garlic into small bowl.
Cook pasta in large pot of boiling salted water until just tender but still firm to bite, stirring occasionally. Meanwhile, cook bacon strips and chopped onion in heavy large skillet over medium-high heat until golden brown, stirring occasionally, about 12 minutes. Add chicken broth, remaining 5 1/2 teaspoons olive oil, and roasted garlic. Bring mixture to simmer, stirring occasionally. Add radicchio, spinach, and basil and stir to combine. Simmer just until radicchio and spinach wilt, about 1 minute.
Drain pasta and return to same pot. Add radicchio-spinach mixture to pasta. Add 1 cup grated Parmesan cheese and crushed red pepper; toss to coat. Season pasta to taste with salt and pepper and serve, passing additional Parmesan cheese alongside.
[ via Bon Appetit magazine, January 2008 ]