From the files of David Scott Allen.
Mix buttermilk. mayonnaise, zest, juice, salt and black pepper in a ceramic bowl 1 hour prior to serving. Let sit at room temperature.
Add pasta to boiling salted water.
Melt butter in a skillet over medium-high heat. When foam subsides, add shallot and cook until just clear. Add shrimp, scallops and red pepper flakes. When shrimp turn pink on one side, turn them and the scallops, then add asparagus pieces. Sauté until seafood is cooked through.
When pasta is done, strain and place in a large serving bowl. Toss with shrimp, asparagus and buttermilk mixture. Serve immediately.
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