Angel Hair Pasta with Clams, Radishes, and Spinach

Bring a large pot of salted water to a boil over high heat. Stir pasta into boiling water and cook, stirring often to keep strands separated, for about 2 minutes, or until tender but still firm to the bite. Scoop out and re­serve 1/2 cup of the pasta cooking water. Drain the pasta. Meanwhile, heat a large heavy skillet over high heat. Add 1 tablespoon of olive oil, then add clams and cook for 1 minute. Stir in shallots, garlic, lemon zest, bay leaf, and red pepper flakes. Add wine, cover, and cook for about 2 minutes, or until clams open. Using tongs, transfer clams to a large bowl, then cover to keep warm. Simmer clam-wine broth until it is reduced by about one-fourth, about 2 minutes (pasta will absorb a lot of liquid, so don't reduce liquid too much). Stir in remaining 3 tablespoons olive oil and season with salt and pepper. Reduce heat to low. Add pasta to skillet and toss to coat with liquid. Add clams and any accumulated juices in bowl to pasta. Add spinach and half of radishes and toss, adding enough of reserved pasta water to make a light sauce. Using tongs, divide pasta and clams among four wide pasta bowls or place them in one large shallow serving bowl. Pour in broth. Drizzle olive oil over each serving and sprinkle with scallions and remaining rad­ishes. Discard lemon zest and bay leaf and serve immediately.