Tomato Sauce: In medium skillet, saute tomatoes in butter; add remaining ingredients and simmer for 15-20 minutes. Set aside.

Fettucine Sauce: In small bowl, beat butter until fluffy. Continue beating while adding egg yolk and then cream. Beat in cheese; season with pepper. Set aside.

Combine: Prepare fettucine in boiling, salted water until tender; drain. In large pan combine fettucine and fettucine sauce; cook briefly until sauce becomes a very creamy consistency. Add tomato sauce; heat through while tossing thoroughly. Serve immediately with 2 crab legs per person if used.