- 6 tablespoons (3/4 stick) butter
- 2 10- to 12-ounce frozen lobster tails, thawed
- 8 ounces shiitake mushrooms, stemmed, thinly sliced
- 1/2 cup (packed) thinly sliced fresh basil
- 6 green onions, thinly sliced
- 3 garlic cloves, chopped
- 1 1/3 cups whipping cream
- 1 8-ounce bottle clam juice
- 12 ounces fettuccine
- 1/4 cup freshly grated Asiago cheese (about 1 ounce)
- Melt butter in heavy large skillet over medium-high heat. Add lobster tails and sauté until shells are bright red in spots, about 5 minutes. Cover skillet; reduce heat to low and cook until lobster is cooked through, about 6 minutes. Remove from heat. Using slotted spoon, transfer lobster to work surface. Using heavy large knife, cut each tail lengthwise in half. Remove meat from shell. Cut meat crosswise into 1/2-inch pieces.
- Return same skillet to medium-high heat (do not clean). Add mushrooms, half of basil, green onions, and garlic; sauté until mushrooms soften, about 5 minutes. Add cream and clam juice. Boil until sauce is slightly thickened, stirring occasionally, about 10 minutes. Reduce heat to low. Add lobster (or shrimp if using) and simmer 1 minute. Stir in remaining basil. Season sauce to taste with salt and pepper.
- Meanwhile, cook pasta in large pot of boiling salted water until tender but still firm to bite. Drain well. Return to pot. Pour sauce over pasta and add cheese; toss over low heat until warmed through, then serve.