Step 1

Cook shrimp in a large pot of boiling salted water just until opaque, about 30 seconds. Transfer to a paper towel–lined baking sheet and let drain.

Step 2

Bring hot sauce, lime juice, Maggi seasoning, and Tajín seasoning to a gentle simmer in a large skillet over medium-low. Whisking constantly, gradually add butter a few pieces at a time. Whisk until all butter is incorporated and sauce is emulsified. Add shrimp and cook, tossing gently and adjusting heat as needed to keep sauce just below a simmer, until cooked through, about 5 minutes.

Step 3

Serve on top of onion on a platter.