Chilled Mussels with Caper Mayonnaise

This is a cocktail party appetizer that takes 5 minutes to assemble once the mussels are steamed and chilled. The sauce is just mayonnaise stirred together with capers, Tabasco, and lemon juice. A quick dollop on each half shell, a parsley leaf if you’re feeling fancy, and you’re done.

The caper mayonnaise is what makes these worth making. Capers bring a briny, vinegary pop that echoes the mussels’ own ocean flavor. The Tabasco adds a slow heat in the background, and lemon juice brightens everything and cuts through the richness of the mayo. Together they create a sauce that tastes custom-built for shellfish.

Serving on the half shell matters. Each mussel sits in its own natural bowl, holding a dollop of sauce. Guests pick them up, tip the whole thing back, and get mussel, sauce, and shell liquor in one bite.

Kitchen Tips

• Steam the mussels just until they open. Overcooking makes them rubbery and tough. The moment the shells pop open, they’re done. Discard any that don’t open.
• Chill the mussels completely before saucing. Warm mussels melt the mayonnaise into an oily mess. Make sure they’re fully cold before assembly.
• Use small capers (nonpareilles) if you can find them. They’re more tender and distribute better in the mayo. Large capers should be roughly chopped.
• Assemble right before serving. The mayo slides off as it sits. Make the sauce ahead, but don’t dollop until guests are nearly ready to eat.

Variations

• Herb mayo: Add 1 tablespoon finely chopped fresh dill or tarragon to the mayonnaise for an herby, French-bistro feel.
• Aioli version: Replace regular mayonnaise with garlic aioli for a bolder, more Mediterranean appetizer.