Fill a large pot with lightly salted water and bring to a rolling boil. Cook fettuccine at a boil until tender yet firm to the bite, about 8 minutes.
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Meanwhile, melt butter in a large nonstick skillet over medium-high heat. Stir in green onions and garlic; cook for 1 minute. Stir in shrimp and scallops; cook for 3 minutes, then reduce the heat to medium-low.