Combine sauce ingredients into a small saucepan and bring to a light simmer, season to taste with salt and pepper. To thin, add a bit of pasta water as desired.
For shrimp, rinse and pat dry. Place some of the spice mixture into a small dish. Lightly dip shrimp in melted butter, then dredge in spice mixture to completely coat. In a hot skillet, fry coated shrimp in batches with a bit of butter or oil, flipping once, until cooked (about a minute per side). Set aside and repeat with remaining shrimp.
To serve, toss pasta with sauce, and top with shrimp. Squeeze some fresh lemon juice over for a bit more flavor if desired.
Notes
The spice mixture will make more than enough, so save any left overs in a sealed container for next time.